CN1091263C - Hue control and regulation method for colour duplication of image - Google Patents

Abstract

The present invention provides a new color analysis technique which can adjust and unify dark colors, light colors and color tones in color reproduction image manufacture, and the adjustment and the unification of the dark colors, the light colors and the color tones are difficult to realize in the prior art. The pixel light values obtained according to manuscript images via characteristic curves of recording media are converted into lattice point conditions. The color management and regulation method at the time for manufacturing the color reproduction image comprises the steps: color management points (M1) are set in desirable positions from H to S parts; color adjustment conditions are defined by percentage values of the lattice points of color plates at the M1 points; the conversion formula of the dark colors and the light colors is used for converting light values into the percentage values of the lattice points ( the gradation conversion formula of the dark colors and the light colors), the gradation conversion and the color management are carried out, and Yn=Yh+[alpha(1-10<-KX>)(Ys-Yh)/(alpha-beta)].

Description

The tone management method of adjustment of color dub image

The present invention relates to the image information that obtains from the colored original image that is recorded on the various recording mediums, for example the image information that obtains from color negative film (transmission-type) original image of the continuous accent of records photographing on the photosensitive emulsion layer is carried out deep or light modulation and is changed, the tone management method of adjustment that is suitable for when making the color dub image (printed images) etc. of the deep or light accent in site (half transfers).

In more detail, provide and a kind ofly make the new deep or light modulation that the color dub image uses and change technology, promptly as the image information of colored thick manuscript base time image, not to utilize existing concentration information value, but utilize light value, so that get rid of influence by the family curve (by the definite family curve of the concentration value that incides the light value on the recording medium and on recording medium, form) of recording medium, simultaneously using specific deep or light accent transform that the brave above-mentioned light value of colored original figure is carried out deep or light modulation when changing, can be quantitatively and reasonably control deep or light accent (also being called deep or light grade or gradation), also comprise tone certainly.

As mentioned above, the present invention relates to the new deep or light modulation that the control of deep or light mediation tone is united is changed technology.But, the following explanation of relevant invention, the hue adjusting method that makes in the existing technology rationalizes with laying stress on, on the meaning of quantification, particularly be placed on the management method of adjustment of tone.

Therefore, should be noted that range of application of the present invention be not limited to make half transfer the color dub image time the tone management method of adjustment, reasonably carrying out aspect the deep or light regulation and control system simultaneously, the present invention also is important.

As everyone knows, according to the colored original image that is recorded on the various recording mediums, utilize various reproduction technologies, can make various color dub images such as the image of printed images, duplicating image, printer output and TV (video) image (among the present invention so-called " duplicating image ", should be the explanation of broad sense in the above-mentioned meaning).

In the making of these color dub images, extremely important problem is: first, should on the color dub image, reproduce deep or light accent (gradation) and the tone (Color tone) that the colored original image is had with Hi-Fi (High-Fidelity, Hi-Fi colour); The second, it should be adjusted to image with desirable tune.

But the present situation of prior art is reasonably, to finish above-mentioned problem with having operating rule.

This is because of in the technology that is reproduced in truly at the tune with above-mentioned colored original image on the color dub image, and be adjusted in the technology of desirable tune at tune with the colored original image, being used for that the image information as basic colored original image is transformed to half transfers the nonlinear transformation treatment technology (changing the deep or light accent converter technique of technology or image with the deep or light modulation of calling image in the following text) of deep or light accent not possess rational rationale, to rely on people's experience and intuition to a great extent, due to non-science, the non-deep or light modulation that reasonably carries out image change.

Below, the manufacturing technology of quoting color printing image is described as representative and be concrete technology category.

In the prior art, according to color negative film (have in the color negative film original copy 90% be transmission-type) when the making duplicating image is color printing image, not only do not lay stress on the highlights (H portion) reasonably held from the color negative film original copy on the concentration characteristic of the darkest portion (S portion), and be " the colored decomposition curve (also be colored apportioned effort family curve; site accent family curve " etc. of the correlationship of the color printing image transferred of site with color negative film original image that decides continuous accent and duplicating image) setting, can be described as the experience and the intuition that rely on the people fully.

The method for making of color printing image, normally utilizing color scanner that color negative film original image (hereinafter to be referred as the colored original image) is carried out colour decomposes, and carry out polychrome plate-making (being one group with C version, M version, Y version, BL version these 4 editions usually), duplicate the color printing image that transfer the site.

As everyone knows, above-mentioned C version (dark green), M version (peony), and the structure of Y version (yellow) be with additive color process in R (redness), G (green) and the relation of the complementary color in the corresponding subtractive color process of B (blueness), the BL version is called black print or China ink version.

Above-mentioned color scanner or whole color scanner are the high devices of price of electromechanical integration, and its instream factor is extremely low, on average is about 30%.It in the industry a very big problem, the instream factor of the color scanner of high price etc. is but as above-mentioned so low, its main cause is operation color scanner needed setup time (Scanner Setuptime) Products Quality instability long and that obtained by the color separation operation and insufficient, often needs to scan (vescan remake) etc. again.

From technological standpoint this is analyzed as can be known a little, as mentioned above, apparatus as the color separation operation, the surface looks like the color scanner of the electromechanical integration of using senior and high price etc., but not several major technique, for example color rendition, colour-compensating, colour correction (the Color Reprodnction in the colored apportioned effort with unitarity, Color Corre-ction) technology and deep or light accent (Gradation) converter technique form system, we can say that this is the low main cause of instream factor of color scanner.

As everyone knows, in two above-mentioned major techniques, can utilize masking equation (Masking eguation) or Niu Gaier equation (Neugeballer equation) etc. that technology such as color rendition are carried out Science Explorations.

The deep or light modulation that is image about back a kind of technology changes technology (this can be summed up as the problem that the whole pixels in the colored original image will be set at great site), also do not have rational rationale, this part still is in dependence people's the experience and the state of intuition to a great extent.

In this state, in order to develop the colored various machines that decompose usefulness, still immature from the basic designing technique of carrying out colored viewpoint one machine that decomposes itself on the unified basis of adjusting the deep or light accent of color harmony, in addition, in actual job, use high price and advanced electronic color decomposer (color scanner) on one side, infer by operating personnel again on one side and carry out operation, the experience and intuition (the Without operator evalu-tion that can't get rid of operating personnel, Without operatar ' s guess Work), can not often make stable high-quality color printing image.

Particularly when the colored original image is not the standard original copy of making by suitable photography and conditions of exposure, suitable video picture condition, for example, just can not carry out colored apportioned effort rationally, effectively because of under over-exposed too bright original copy, the situation because of the original copy of the too dark original copy of under-exposure, light tone or low key tone and the original copy of chromatic colour photographic fog (Colorcast) or the original copy that fades non-standard original copys such as (faded original).Promptly can not reasonably carry out colored apportioned effort, cause the instream factor of above-mentioned color scanner low, Products Quality is unstable, problem such as scan rate increase again these off-gauge colored original images.

Present inventor's basic understanding is, for the quality (quality of estimating from two aspects of deep or light mediation tone) of verily reproducing the colored original image, this is certain, and then according to above-mentioned various colored original images, reasonably make the half color dub image of transferring with desirable tune (deep or light mediation tone), before improving color rendition, colour-compensating (correction) technology, must make the converter technique of gray shade scale of each pixel of colored original image reasonable.

In addition, the deep or light accent of known colored original image is in the pixel of giving sizing (also we can say the size by a pixel of screen line number regulation), the ordered state (many-valued area modified tone method) or the concentration (directly concentration is transferred method) by changing pixel itself of the size (area modified tone method) of the point by changing site etc. or the site by changing prescribed level are transferred the concentration of original copy pixel on the color dub image that is reproduced in half accent.As mentioned above, various methods are arranged, but for convenience of explanation, below half accent is called the site and transfers as half technique of expression of mixing colours.

Basic understanding based on the invention described above person, the original new deep or light accent transform of basis that proposes of present inventor, reasonably colored original image deep or light transferred in method that the deep or light modulation of row changes and received that certain effect (for example is willing to clear 63-114599 number, USP4,924,323 referring to the spy; Special hope flat 1-135825 number, USP5,313,310; Special hope flat 1-212118 number, USP5,057,931; Special hope flat 3-78668 number, USP5,134,494 etc.).

Because original new deep or light accent converter technique and the present invention who proposes of present inventor has deep relation, thus the outline of above-mentioned once deep or light accent converter technique is described in this article, and illustrate its improved aspect in addition.Much less, above-mentioned improvements constitute necessary technical conditions of the present invention just.

With the example that is made as of color printing image, go on to say the manufacturing technology of color dub image.

In the prior art, the colour decomposition of coloured image is performed such, promptly the original image by explanatory note (refers to the body that is taken, real image, actual landscape, the body that for example is taken supposition is an apple, just be meant apple itself), conditions of exposure in regulation is (well-known, when going into the body light intensity is I, time of incidence is when being T, exposure E=IT) under, the body that is taken of incident is recorded in " recording medium " that is called sensitive photographic material (photosensitive latex) goes up and obtain photochrome,, carry out colour decomposition (so-called color separation operation based on the concentration information of this photochrome, as mentioned above, comprise gradation reproduction and tone rendering two aspects).

As everyone knows, by developing, form sensitization concentration (photographic density) on the sensitive photographic material of the body that is taken of taking still life or personage, this is a media image.Represent that the above-mentioned egative film concentration (blackness) and the curve of the correlationship of the exposure E of photographic photosensitive material are called sensitization concentration family curve (photographic density characteristiccurve).It is to be egative film concentration (D) (D=logI with the longitudinal axis ₀/ I), transverse axis is the curve of logarithm value (logE) expression of exposure E.Certainly, for egative film or dry plate (transparent copy), adopt transmitted light intensity I and incident intensity I ₀Ratio, and, will adopt reflective light intensity I and total reflection light intensity I for photographic paper (reflextion copy) ₀The ratio.

Above-mentioned egative film concentration family curve (hereinafter to be referred as the concentration family curve) is most typical to be the curve (referring to Fig. 1) of the complexity of a kind of rear that lower end convex under the dawn arranged, middle straight-line segment, shoulder section that convex is presented in the upper end slightly linearly.

And in existing technology, colored apportioned effort is that the concentration information value with each pixel of colored original image is that carry out on the basis.

In other words, colored decomposition technique of the prior art is a kind of technology of setting up from the position of the characteristic longitudinal axis of above-mentioned concentration (density axle).And, in existing technology, image information value (concentration information value) and original image (real image as the colored original image (media image) on the basis of colored apportioned effort, body is taken, outdoor scene) disproportional relation between the image information, but recording medium, the sensitometric characteristic (density characteristic curve) that is photographic photosensitive material (photographic latex) but has a significant impact it, that is, media image be the colored original image egative film concentration not with from the body (real image that is taken, outdoor scene) image information value is exposure (logarithm value) linear relevant (45 ° of linear relationships of 1: 1).

In addition, the vision of known person is logarithmic relationship to the resolution characteristic of light and shade, and the people distinguishes characteristic according to above-mentioned striving, and the light quantity that incides vision system from the body that is taken is carried out light and shade estimates.In the case, the people is the sensation that linear image just can produce nature for the slope of concentration change.

From the above, when making color printing image, if according to the detected concentration value (D=logI that is recorded in the media image on the sensitive photographic material ₀/ I), carry out colored apportioned effort, utilizing above-mentioned concentration so is the concentration information that is subjected to after the sensitometric characteristic influence of photographic photosensitive material, rather than the image information value (light value) that utilizes the body that is taken (real image, outdoor scene) with the real object that is replicated to obtain.

The present inventor is according to above-mentioned situation, following method has been carried out conscientiously research, image information during promptly as the making color printing image, be not to use sensitometric characteristic (concentration family curve) according to recording medium (sensitive photographic material) be transformed into the value of information of nonlinear media image method, be the analogy method of concentration value, and be to use based on the image information value relevant that obtain from the body that is taken (real image, outdoor scene), the method for making printed images with (original, initial) the 1st property exposure value.

Result of study finds, in colored apportioned effort, carrying out most important deep or light modulation when changing operation, adopts following method to produce to have the color printing image of excellence of the picture characteristics of the faithful to body that is taken (real image, outdoor scene).Promptly

(1) according to the longitudinal axis (D=logI of the concentration family curve (sensitization concentration family curve) of taking the sensitive photographic material that the colored original image write down ₀/ I) concentration value is obtained the value (to call the longitudinal axis in the following text is the D axle, and transverse axis is an X-axis) of transverse axis (logE), in other words, according to the concentration value on the D axle of colored original image (media image), obtains the light value on the X-axis.

(2) more particularly,, the concentration information value (Dn) on the D axle of the pixel arbitrarily on the original image (n point) is projected on the X-axis, obtain the image information value (Xn) with the exposure of its corresponding relevant pixel, then by above-mentioned concentration family curve

(3) with according to the Xn value (light value) that obtains based on upper type, and according to the present inventor originally the deep or light accent transform of proposition (it and the described deep or light accent transform of employing in the present invention in back are identical.But utilizing aspect scope and the range of application of above-mentioned deep or light accent transform, the present invention is diverse) the deep or light modulation that carries out image changes, thus make the color dub image of the high-quality picture that possesses loyal picture characteristics.

From the above, the original deep or light modulation technology of changing that proposes of present inventor is to make the site to change technology as most important deep or light modulation when transferring the color printing image of (half transfers).

Promptly, the deep or light modulation that foregoing invention person proposes changes technology, on primary meaning, be make comprise the colored original image, make the deep or light accent of various original images reach 1: 1 informativeness, be the technology that the color dub image of deep or light accent nature is used from people's vision.

The above-mentioned deep or light modulation technology of changing can not only be used for the colored original image of standard, and can be used for off-gauge original copy (over-exposed or under-exposed, light tone or low key tone even chromatic colour photographic fog or original copy of fading etc.), make its reproduction can think to be taken deep or light accent that body (real image) had.

Change in the technology at above-mentioned deep or light modulation, owing to can reproduce deep or light accent truly, so can reproduce the tone rich content really.

, as mentioned above, can estimate the original deep or light modulation technology of changing that proposes of present inventor as follows, i.e. this technology

With regard to primary meaning, in colored apportioned effort, pay attention to the conversion of deep or light accent, promptly

Pay attention to realizing the Hi-Fi conversion (between the duplicating image of original image of transferring continuously and site accent, high-fidelity deep or light modulation in ground changed in 1: 1) of deep or light accent

Utilize above-mentioned deep or light modulation to change technology, the energy height carries out deep or light modulation truly and reasonably and changes, and follows above-mentioned deep or light modulation to change, and tone also can reproduce with abundant really.

, market is not to rest on as the duplicating on this demand of the color printing image of tune (level and tone) with colored original image to the demand of the quality of coloured image, but more and more requires senior, complicated, diversified.

For example, the hope that has emphasizes to reproduce the color of specific part (personage, pottery class, clothes class, furniture, wooden category, drawing etc.) in the colored original image or privileged site (zone) etc., perhaps wishes integral color is altered to various demands such as desirable tone such as blue cast, dark green tone, light green tone, pink tone, Ink sepiellae seu sepiae tone.

Corresponding to these demands, if adopt existing colour-compensating (Color Correction) technology, promptly enable with the tone requirement of reproduction, and the whole tune of image has been distorted for specific part, thereby make the picture quality severe exacerbation, be faced with the problem that can't satisfy the demand.

Self-evident, in order to adapt to the demand, it is important needing the converter technique of a kind of so deep or light mediation tone of establishment, and promptly this technology can all be felt nature for these two aspects of tune of the color harmony integral image of specific part or privileged site (zone) according to people's vision.

For the High Level that adapts to the above-mentioned market demand, complicated, mean that in colored decomposition technique the deep or light modulation of requirement changes unitized (syncretization) of technology and tone adjustment technology.

At this moment the problem that must be noted that is that the site that forms color printing image also can be described as (or density and colour) two aspects with deep or light accent (gradation) and tone (Color tone) usually all direct relation.Yes for this because the factor of decision picture quality is the size (determining deep or light accent) of site and the coloring printing ink (decision tone) that is coated with at place, above-mentioned site.

And, change in the technology at the original deep or light modulation that proposes of present inventor, established the method for reasonably adjusting the size of management site.Therefore, the present inventor thinks: the original deep or light modulation that proposes of the unitized present inventor of being of above-mentioned deep or light key adjusting technique and tone adjustment technology is changed the extension of technology, also have conscientious research simultaneously.

Its result, the present inventor obtains such opinion, promptly adopt as original deep or light modulation that proposes and change the deep or light accent transform of the core of technology, and when being blended in the idea of tone adjustment wherein, in colored apportioned effort, can reasonably adjust aspect two of the deep or light accent of management color harmony.

The present invention is that finish on the basis with above-mentioned opinion, its objective is provides a kind of color scanner that comprises following technology, promptly utilize the present invention reasonably to adjust the colored decomposition technique of management color harmony level two aspects, be regarded as tone management adjustment technology difficulty, that in the process that abundant deep or light accent reproduces, tone can be adjusted into desirable tone in the particularly existing technology.

As mentioned above, the present invention provides a kind of colored decomposition technique that both unite with deep or light mediation tone.

, in the following explanation of relevant color scanner of the present invention, in view of existing technology can not be managed the present situation of tone reasonably, quantitatively, so focus on especially on the management adjustment method of tone.

With the present invention to sum up, the present invention is a kind of tone management method of adjustment when making the color dub image of transferring the site, be used for family curve (inciding the light value on the recording medium and the correlationship curve of the concentration value that on recording medium, forms) by recording medium, the light value of each pixel that the colored original image that will be write down on the given recording medium obtains is transformed into half deep or light accent (transferring to call the site in the following text), make the color dub image, the feature of this tone management method of adjustment comprises that following operation constitutes:

1. the tone management point (M that the tone of management color dub image is used is set at the desirable position between the H of colored original image portion (highlights)～S portion (the darkest portion) ₁).

2. at above-mentioned tone management point (M ₁), with the regularization condition of the big or small specified hue of the site of desirable look version (C version, M version, Y version and BL version).

3. with above-mentioned tone management point (M ₁) below the size of site of look version of the light value located and the above-mentioned tone regularization condition of reflection and the big or small substitution of the desirable site set in H portion and S portion＜the hierarchical transformation formula 〉, obtain the γ value, list light value with the pixel of the H portion～S portion of above-mentioned colour table become the site size usefulness＜deep or light accent transform).

With the version usefulness of all kinds of determining above-mentioned γ value＜deep or light accent transform, the light value of each pixel of version usefulness of all kinds is carried out deep or light modulation changes, check colors simultaneously and transfer in the adjustment of line pipe reason.

＜deep or light accent transform 〉

Yn=Y _H+ [X (1-10 ^-kx) (Y _S1-Y _H)/(alpha-beta)] should＜deep or light accent transform in the meaning of each symbol as follows: X: expression (X _n-X _H).Promptly represent to obtain concentration information value (D with any pixel (n point) of colored original image from the family curve that utilizes above-mentioned recording medium _n) corresponding light value (X _n) deduct by the concentration information value (D that obtains with quadrat method with the H portion of colored original image _H) corresponding light value (X _H) after the basic light value that obtains.

Y _n: at the colored original image on the corresponding color dub image of pixel arbitrarily (n point) on pixel set the size of site.

Y _H: at the colored original image on H portion in the H portion on the color dub image, preestablish the size of site.

Y _S: at the colored original image on S portion in the S portion on the color dub image, preestablish the size of site.

α: the surface reflectivity of the image appearance medium that the recording colour duplicating image is used.

β: by β=10 ^-γThe numerical value of decision.

K: by K=γ/(X _S-X _H) decision numerical value.

X in the formula _SConcentration information value (the D of the S portion of the colored original image that expression and the family curve that utilizes above-mentioned recording medium are tried to achieve _S) corresponding light value (X _S).

γ: any coefficient.

Describe technical pattern of the present invention below in detail.

For convenience of explanation, image information value and original image at first are described in this article.

In the present invention, the image information of using as according to colored original image making color dub image the time is not to use and concentration dependent image information value, and is to use the image information relevant with light quantity that this is a big feature as existing technology.

In the present invention, the colored original image is meant the image that writes down or accumulate on the given recording medium, also it is referred to as media image.And on the other hand, but will write down or accumulate in image before on the above-mentioned recording medium, promptly the image as the real object that duplicates is referred to as solid images (body that is taken, material object, outdoor scene).

Below quote the example that is made as of color printing image,, go on to say tone management method of adjustment of the present invention as the color dub image.

Therefore, this is for convenience of explanation, and does not mean that tone management method of adjustment of the present invention only is applicable to duplicating of color printing image.

In order to understand the present invention, the back also will describe tone in detail and adjust method, and at first simple declaration utilizes above-mentioned＜deep or light accent transform now〉deep or light modulation change technology.

As mentioned above, now in the copy job of color printing image, use this colored decomposer of color scanner extremely at large, colored apportioned effort in this device is (being media image from the colored original image, comprising transmission-type original copy and reflection-type original copy) the concentration information value that obtains carries out for the basis, more particularly, the making of color printing image, as method commonly used, normally according to passing through R, G, each egative film of B, from the concentration information value that colored original image (media image) obtains, make C version (dark green), M version (peony), Y version (yellow), BL version (black).

, utilize the method for the concentration information value that is recorded in the colored original image (media image) on the recording medium that is referred to as photographic photosensitive material like this, be subjected to aforesaid restriction (shortcoming).

Otherwise as mentioned above, the present invention but is to be starting point with a kind of like this idea; The real object that promptly duplicates is not the image (media image) that is recorded on the recording medium, and be all the time with as media image basic, with the colored original image of textual representation, just be taken of body (real image) itself, when duplicating can with the image information value that utilizes should based on incide from the body that is taken on the recording medium, the image information value relevant with light quantity.

Above-mentioned problem is the basic difference that deep or light modulation of the present invention changes technology and existing technology.

From the another one angle this problem is described below.

In colored decomposition technique, the colored original image that must will transfer continuously (for example color negative film original copy of transmission-type) is transformed into the color printing image that transfer the site.But as mentioned above, regulation continuous toned image and site change the line map picture correlationship be colored decomposition curve (deep or light modulation changes curve).And existing colored decomposition curve is being that concentration information value that the D axle (concentration axle) of the characteristic curve (the sensitization concentration family curve of stipulating in D axle-X-axis rectangular coordinate system) on the sensitive photographic material go up to form serve as the basis setting in recording medium.

Different therewith, colored decomposition curve of the present invention all is serve as basic setting with the image information value relevant with the light quantity of the body that is taken (real image) on the characteristic X-axis of sensitization concentration as mentioned above.That is, in existing colored decomposition technique, the colored decomposition curve of the D axle of use, and different therewith, the present invention but can be to use the colored decomposition curve of X-axis, this is both basic differences.

Secondly of the present invention＜deep or light accent transform is being used in explanation〉the deep or light accent converter technique of image in, ask for the colored original image each pixel image information value method, promptly ask the method for light value.

The family curve of the photographic photosensitive material of the recording medium of using in the time of at first will preparing as shooting colored original image (media image) specifically, will prepare to represent sensitization concentration value (D=logI exactly ₀/ I) be the relevant image information value of light quantity on the photographic photosensitive material with incide above-mentioned recording medium from the body that is taken (real image, outdoor scene), i.e. the concentration family curve of the relation between the logarithm value of exposure (E=IT).

Secondly, for by above-mentioned concentration family curve, according to the concentration value (D of any pixel in the colored original image (n point) _n), obtain light value (X _n), and with above-mentioned concentration family curve function to indicate.What at this moment, will (for example) be provided as technical information by sensitive photographic material factory carries out function to indicate with the corresponding concentration family curve of above-mentioned recording medium and handles and get final product.If can reasonably carry out function to indicate, then can be at an easy rate with the D on the D axle _nValue transform becomes the X on the X-axis _nValue.

Fig. 1 indicated concentration family curve (F corporate system, Fuji's colour film).

In addition, table 1 has provided the result with the concentration family curve formulism among Fig. 1.As shown in table 1,, formulism is divided into 8 districts carries out concentration family curve formulism for as far as possible correctly, tentative formulism in each district.Certainly formulism is distinguished many more, can be obtained correct functional expression more.

The characteristic functional expression complete list of table 1 concentration

F company colour film (FUJICHROME) concentration family curve (Fig. 1)

In the characteristic formulism of above-mentioned concentration, make the scale on the X-axis of scale and logE image information value that represent, that be correlated with light quantity on the D axle of concentration value of expression colored original image (media image) identical, obtain the function of regulation D and X correlationship with the body that is taken (real image).

This is a kind of analog computation of carrying out according to following viewpoint, and the present inventor thinks reasonably.This means and be to use this term of the analogue value on the X-axis in Fig. 1.

Promptly originally in photograph concentration family curve, scale is the logarithm value (logE=logIXT) of exposure E on the X-axis, this is corresponding to such fact, promptly with the corresponding resolution characteristic of the light and shade of vision and the same to the understanding (vision) of the concentration on the D axle, be logarithm, can think that therefore the simulation of relevant above-mentioned scale is rational.

In the present invention, above-mentioned scale is a kind of short-cut method, not limit by this.

As mentioned above, the present invention is recorded in the concentration value (D that recording medium (photographic photosensitive material) goes up the colored original image (media image) that forms so that the body (real image) that is taken is taken _nValue) be the basis, but to incide image information value (X on the recording medium, relevant with the light quantity of representing with X-axis from the body that is taken (real image) _nValue) is the basis.

As mentioned above, the concentration family curve is as shown in table 1, and by this functional expression of X=f (D) as can be known, the Dn value is relevant with the Xn value, therefore can obtain the Xn value easily according to the Dn value.

Ask for the method for light value (Xn value) from the concentration value (Dn value) of above-mentioned colored original image, be equally applicable to this typical colored original image of original image of color negative film (transmission-type), promptly be applicable to as recording medium and have the colored original image of specific sensitization concentration transmission-type characteristic, that constitute by the photosensitive emulsion layer.

On the other hand, as being reflection-type colored original images such as drawing, this concentration family curve can be used as linearity curve and uses, and promptly uses as 1: 1 relevant curve of concentration value (Dn value) and light value (Xn value).

More particularly, the concentration value (Dn value) that records directly can be used as light value (Xn value).

Secondly, the deep or light modulation technology of changing of the present invention is to use light value (Xn value) and the above-mentioned＜deep or light accent transform of obtaining as mentioned above 〉, obtain colored decomposition curve (deep or light modulation changes curve), promptly, just can carry out the deep or light modulation of image and change as long as existing D axle color separation is separated line to be changed slightly and obtain the colored decomposition curve of X-axis.

Promptly, according to given concentration family curve, the concentration value of locating by any pixel on the original image (n point) (Dn), obtain the relevant image information value (Xn) of light quantity of corresponding pixel with it, by should (Xn) the value substitution above-mentioned＜deep or light accent transform, calculate contrast factor value (Yn), promptly dot area % value (hereinafter to be referred as the size of site) (Yn).In the halftone generator with the big or small input color scanner of this site, can form desirable dot matrix.

Here illustrate simply of the present invention above-mentioned＜deep or light accent transform derivation.

Site % value (Yn) usefulness of the site that transfer the above-mentioned site of calculating when making color printing image＜deep or light accent transform) be to derive from the concentration formula (sensitization concentration, optical concentration) of generally acknowledging, promptly derive from following formula

D＝logI ₀/I＝log1/T

I ₀=incident light quantity

I=reflection light quantity or transmission light quantity

T=I/I ₀=reflectivity or transmissivity

If the general formula of above-mentioned relevant density D is applied to plate-making, when printing, then becomes following formula:

Concentration (D when plate-making, printing ¹)=log (I ₀/ I)=reflectivity of log unit area * paper/[reflectivity of (unit area-dot area) * paper)+surface reflectivity of dot area * printing ink]

＝log×A/[α{A-(d1+d2+……+dn)}+β(d1+d2+……+d2)]

A in the formula: unit area

Dn: the area of the various sites in the unit area

α: the reflectivity of printing

β: the surface reflectivity of printing-ink

The present invention is the concentration formula (D ') based on relevant this plate-making, printing, make it the theoretical value and the actual measured value unanimity of the relevant connection of the size (Yn) of site at the specimens point place on the color printing image of the basic concentration value (X) located with the colored former specimens point of transferring continuously arbitrarily (pixel) (n point) that does on the image and site corresponding accent, derive above-mentioned＜deep or light accent transform〉with it.

When utilization of the present invention above-mentioned＜deep or light accent transform, when making duplicating image such as color printing image, the % value of site is the following numerical value of use usually, promptly during the C version, Y _HBe 5%, Y _SBe 95%, when M version and Y version, Y _HBe 3%, Y _SBe 90%.In addition, using above-mentioned＜deep or light accent transform〉time, if concentration value working concentration instrumentation definite value, Y _HAnd Y _SWhen using percent numerical value as described above (% value), also to calculate Y by percent numerical value (% value) _nValue.

Use of the present invention above-mentioned＜deep or light accent transform the time, certainly by using after the following distortion, also can process arbitrarily, be out of shape, use after the derivation etc.

Y _N＝Y _H+E(1-10 ^-KX)·(Y _S-Y _H)

E=1/ in the formula (1-β)=1/ (1-10 ^-γ)

Above-mentioned variation is got α=1 and o'clock is obtained.

This is to be taken as 100% o'clock relational expression for the surface reflectivity that shows the employed printing of color printing image (ground).In fact the desirable arbitrary value of α is got 1.0 and is also had no relations.Even this situation is suitable for when luminance pictures such as video image too.

If adopt above-mentioned variation (α=1.0), then can be as predetermined Y on the highlights (H portion) on the setting color printed images _H, the Y in the darkest portion (S portion) _SThis is of the present invention one big feature.The problems referred to above can illustrate according to the following fact, i.e. H portion on color printing image, and according to definition, X=O is in addition at S portion, X=X _S-X _H, promptly

-K·X＝γ(X _S-X _H)/(X _S-X _H)＝-γ

Like this, owing to utilize of the present invention＜deep or light accent transform〉(variation of α=1), can set predetermined usually Y to H portion on the color printing image and S portion _HValue and Y _SValue.This outer problem is an extremely important problem when at the user operation result's evaluation being investigated.That is the Y in the setting color printed images, _HY _SBe desirable value, change γ value (but α=1.0) again, just can obtain the colored decomposition curve (deep or light modulation changes curve) of various X-axis.The mass content of the color printing image of making according to the colored decomposition curves of these X-axis and the relation between the γ value just can be estimated at an easy rate.

Utilize of the present invention above-mentioned＜deep or light accent transform when setting the colored decomposition curve of X-axis (the deep or light modulation of layer changes curve) of version of all kinds of polychrome plate-making (using these four kinds of versions of C version/M version/Y version/BL version usually) usefulness, can followingly carry out.

In the industry, method commonly used is the colored decomposition curve of at first setting as the C version usefulness of benchmark (deep or light modulation changes curve), sets other look version then, so that keep gray balance or colour balance.

Above-mentioned so-called gray balance is that the condition of reproducing neutral concentration (gray scale) with three look versions (C/M/Y version) is an essential condition.In the industry, in order to keep gray balance, the standard value shown in the table 2 below adopting usually.

In the table 2, M ₁It is the gray balance management point (hereinafter referred to as intermediate point) that the mid point of the dynamic range (concentration range) of H portion～S portion is set.In the industry, above-mentioned M ₁Point is as shown in table 2, and usual way is that the size with the site of C version is set at 50%.To M ₁With the mesh point sets of C version is that the main reason of 50% value is to generally believe that the zone of the size of this site is the abundant reproduction district of deep or light accent.

In the industry, can see by table 2, at M ₁Point (middle tone), the size of the site of C version are 50%, the size of the site of other look version (M/Y version) are set in 40%, to keep gray balance.

Table 2 is kept the standard value (unit: the size of site) that suitable gray balance is used

	H	M1	S
				The C version	5	50	95
The M version	3	40	90
				The Y version	3	40	90

As mentioned above, deep or light modulation of the present invention changes technology when making color printing image, be not to use the concentration information value of obtaining from colored original image (media image) (Dn), and be to use and incide the relevant image information value (Xn) of light quantity that forms on the recording medium that media image uses from the body that is taken (real image), and be using above-mentioned＜deep or light accent transform〉as prerequisite, can have operating rule, ubiquity, flexibly make the color printing image of the deep or light accent characteristic of the faithful to body that is taken (real image), can also further deep or light accent characteristic be transformed into the color printing image of desirable half tone characteristic.

Next illustrates core technology structure of the present invention, promptly changes the tone adjustment technology that increases in the technology at above-mentioned deep or light modulation, in other words, illustrates that exactly deep or light modulation changes management adjustment technology unitized of technology and tone.

The unitized key of above-mentioned deep or light mediation tone be following some:.

(1) as mentioned above, original that propose and be the above-mentioned＜deep or light accent transform that uses in the present invention by the present inventor 〉, the % value that is used for adjusting the whole pixels site (point) in the H portion～S portion of color printing image (in other words, be exactly the size of site) important tool, the deep or light accent characteristic that is had so as to the colored original image of the faithful reappearance primary, and it is adjusted to the visual sense feeling that the makes the people deep or light accent characteristic to nature.

(2) size of the site that each pixel is set often has with two aspects of deep or light mediation tone (or concentration and color) relevant influence power is all directly arranged.

(3), not only will make 1: 1 ground of colored original image reproduce (Hi-Fi reproductions), and for the specific part of image, the requirement that the tone of the privileged site of the dynamic range of H portion～S portion is strengthened, changes, proofreaied and correct is also in increase according to the market demand.

In above-mentioned requirements, client and deviser with the big mere suggestion of site, specify the content that requires by the colour atla (Colorchart, the back will be illustrated it) that they held.

(4) by existing colored decomposition technique, when the demand is dealt with in particularly existing colour correction, even for example make the tone of specific part reach the content that requires approx, but the tune of integral image (deep or light mediation tone) not just, has lost the value of goods under many circumstances.

Above-mentioned colour atla (color chart) is to use the basic colour code (reference table) that prints with processing 4 former color inks or using with the deep or light mileometer adjustment color rendition of color now of site.For example arranged " DICGRAF-C colour atla " (in March, 1991) of Dainippon Ink. ﹠ Chemicals Inc's distribution etc.

In above-mentioned colour atla, be the combination of the various look versions used of color rendering, array mode has following several.

1. basic combination

With the combination of C (dark green) and M (peony) as basic colour atla.

Being that the longitudinal axis, (M) are transverse axis with (C) for example, is that 0～100% the deep or light row of transferring in of 12 kinds of layers is printed as basic tinctorial pattern with the size of site respectively, and overlapping being printed on this basic tinctorial pattern of Y (yellow) BL (black) that will have the size of certain site again forms colour atla.Above-mentioned Y or BL with size of certain site has Y=10%, BL=10%; Y=10%, BL=30%; Y=50%, the BL=10% equivalence.

2. other combination

(1) being the longitudinal axis with (Y), (M) is the combination of transverse axis

(2) being the longitudinal axis with (C), (Y) is the combination of transverse axis

(3) being the longitudinal axis with (BL), (Y) is the combination of transverse axis

(4) being the longitudinal axis with (BL), (M) is the combination of transverse axis

(5) being the longitudinal axis with (C), (BL) is the combination of transverse axis

As mentioned above, the tone on the colour atla is with the big or small appointment of the site of version of all kinds (C/M/Y/BL/).

Therefore, according to above-mentioned colored sketch, corresponding to client or the printed design person modulation requirement more of checking colors, colored decomposition technique is wanted must guarantee quantitatively and reasonably management certainly, adjusts the size of whole sites of each pixel.

According to above-mentioned background, the present inventor thinks above-mentioned＜deep or light accent transform〉having fully can be quantitatively and the ability of size that reasonably site of H point～whole pixels of S point is adjusted in management, also is strong instrument for the adjustment of tone therefore.This is to adopt above-mentioned＜deep or light accent transform〉as main tool, develop the key point of the unified colored decomposition technique of deep or light mediation tone.

The colored decomposition technique that the unification of deep or light mediation tone is adjusted of the present invention, the summary that has particularly increased the colored decomposition technique that the management of tone adjusts is as follows:

1. at first, desirable position between the H of colored original portion～S portion, the tone management point (M that the tone of setting management color printing image is used ₁).

In the present invention, as tone management point (M ₁) symbol, use with table 2 in keep the medium tone point (M that gray balance is used ₁) identical symbol.This is the main points that make the deep or light accent reproduction in medium tone zone in the colored decomposition technique, therefore also reflects its importance in the process of tone rendering.Tone management point (M ₁) be not limited to the above-mentioned middle tone point that gray balance is used of keeping, can certainly between H portion～S portion, get desirable point.

Tone management point (M ₁) size of expression site) and transverse axis (X-axis: the expression light value) in the rectangular coordinate system of formation, represent tone management point (M as the embodiment of back and shown in Figure 2, in the longitudinal axis (Y-axis: with the light value on the transverse axis ₁).Above-mentioned light value is relevant with the concentration value of colored original image, so the usable concentration value representation.

2. secondly, at the tone management point (M of as above appointment ₁), with the regularization condition of the size decision tone of the site of desirable look version (C version/M version/Y version/BL version).

The particular content of the adjustment of above-mentioned tone (change) condition had been done explanation when the explanation colour atla.

3. next step is to utilize above-mentioned condition and specified criteria, prepare used colored decomposition curve (deep or light modulation changes curve) for using various look versions (C version, M version, Y version, BL version) to print look domain picture, more particularly, exactly in order to set the colored decomposition curve preparation＜deep or light accent transform of various look version usefulness 〉.

Set by said procedure (1～2)

Tone management point (M ₁) light value, M for example ₁=0.400

The regularization condition of tone, for example size (10%) of the size (10%) of the size (20%) of the size of C version site (50%), M version site, Y version site, BL version site.

Size (the Y of the site of setting in the H of various look versions portion and S portion _H, Y _S) be to set according to condition institute's specified value given in advance or desirable value.Y according to the specified criteria setting _HValue, Y _SThe value, as the explanation of the present invention＜deep or light accent transform application the time as described in, the value of C version is respectively 5% and 95%, the value of M version and Y version is respectively 3% and 90% (referring to table 2).

In order to determine the colored decomposition curve of version usefulness of all kinds, determine employed＜deep or light accent transform according to above-mentioned condition〉in the γ value.

For example, in order to determine the colored decomposition curve of C version usefulness, will determine＜deep or light accent transform by the following stated〉in the γ value.

With X _H=0.00, X _S=1.00, X _n=M ,=0.40, α=1.00, Y _H=0 (%), Y _S=95 (%), Y _n=50 (%) substitution＜deep or light accent transform〉after find the solution, γ=0.45.So all set set C version usefulness colored decomposition curve＜deep or light accent transform.Other look version is identical therewith.

4. next step program is to utilize γ value (0.45)＜deep or light accent transform is arranged 〉, the light value (Xn) of whole pixels (n point) of H portion～S portion is carried out deep or light modulation change, obtain the colored decomposition curve (deep or light modulation changes curve) of C version usefulness.In other words, exactly in order to make the look domain picture of C version, use the C version＜the hierarchical transformation formula carry out colored apportioned effort.Other look version is identical therewith.

The validity of the colored decomposition technique that deep or light key adjusting technique and tone adjustment technology are united of the invention described above will be proved among the described in the back embodiment.

Now to colored decomposition technique of the present invention, particularly another feature and the range of application for the colored decomposition technique that has increased the whole function of deep or light secondary colo(u)r key describes.

The present invention adjusts in the function in tone management and has increased colored decomposition technique, and its application surface is not limited to the making of above-mentioned color printing image, so be of wide application.

Colored decomposition technique of the present invention can be applicable to, for example, information such as utilization, electromagnetic wave are transmitted medium, body (real image) record will be taken, shooting is on desirable recording medium, perhaps according to the four corner through classes such as the colored original image (media image) after the shooting conversion, making color dub images.

Therefore, be applicable to the system that makes various color dub images, just must use colored decomposition technique of the present invention in order to make it.

At first, when the family curve of regulation recording medium, promptly regulation is represented to incide the image information value (light value) relevant with light quantity on the given recording medium and during the density characteristic curve of the correlationship of the concentration information value that forms in recording medium from the body that is taken (real image), and above-mentioned characteristic regulation variable (factor) is not limited to the logarithm value (light value) of the exposure that illustrated and the combination of concentration information in the colored original image.In the manufacturing system of various color dub images, input medium (recording medium) as the image information of the body that is taken (real image) is the family curve of sensor, can do the explanation of broad sense, can stipulate and concentration dependent concentration information value (Dn value) and relevant image information value (Xn) is relative to each other with light quantity concentration family curve (light-to-signal transfer characteristic curve).

Expression and the physical quantity of this concentration dependent image information value should be done the explanation of broad sense, for example as synonym, reflection density, transmission density, brightness, luminosity, frequency, electric current, magnitude of voltage etc. are arranged.

As the be taken recording medium of body (real image) of record, can be in components of photo-electric conversion such as photographic photosensitive material or two-dimensional CCD, CD, disk, tape, photodiode etc. any one.

Much less above-mentioned concentration family curve relevant with above-mentioned recording medium, reflection recording medium characteristic, is photo concentration family curve (during photographic photosensitive material) and light-to-signal transfer characteristic curve (during the components of photo-electric conversion).

When the colored original image was the reflection-type original copy, yes stipulates with the straight line of 45 ° (degree) in the rectangular coordinate system for above-mentioned concentration family curve.

Secondly explanation has increased the range of application of colored decomposition technique at the management adjustment technology of tone of the present invention.

So far, the above all is the relevant explanation of doing for example of image that makes colored printing specially, but range of application of the present invention is not limited to the making of this color printing image.

That is, the application example as colored decomposition technique of the present invention can be:

(i) be not limited at color printing image such as the relief printing plate that had illustrated, lithographic plate, site photogravure, silk screen or can change seen in the fusion science temperature-sensitive duplicating image example of size (many-valuedization) a little with the deep or light accent of the size performance color dub image of site or the occasion (being also referred to as deep or light accent method of area or the deep or light accent method of many-valued area) of tone, also have following range of application.

The (ii) occasion of the concentration of the pixel of the certain area of being seen in distillation duplicating type temperature-sensitive duplicating image, (utilizing silver salt) hot video picture duplicating image, common photogravure image etc. of change itself, pigment or dyestuff (pigment) isoconcentration that the lining pixel is used change the occasion (being also referred to as deep or light accent method of concentration or the direct deep or light accent method of concentration) that shows deep or light accent or tone.

Passing through of (iii) being seen in digital duplicator (color dub etc.), printer (ink jet type, magnetic bubble injecting type etc.), fax etc. changes the recording density of certain area, for example changes the quantity of point, the quantity of ink droplet waits the occasion (similar with the deep or light accent method of the area in above-mentioned (i), as to be also referred to as deep or light accent method of density or the deep or light accent method of emulation, the deep or light accent method of diadic area) that shows deep or light accent.

(iv) the power of regulating the brightness of unit area by electric signal relevant with image information such as vision signal, TV signal, big visual field signals is come the CRT image of represent images or LCD TV image or is shown the occasion of the colored printing thing made or color hard copy etc. according to these images.

(v) check the medical precision profile of usefulness, the occasion of making the color dub image of the faithful to body that is taken (affected part, focus etc.) as roentgenograph X etc.

(vi) in addition, can also be applied to when display density, also show simultaneously display densities such as size with the site, with the densimeter of deep or light modulation converting mechanism, the machine (for example constitute and use colored verifier) of before colour decomposes, checking usefulness and colored decomposition impart knowledge to students usefulness simulator etc. with print relevant machine etc.

Secondly explanation is used for this technology in order to make the color dub image method of various machines (image processing system) in having increased the colored decomposition technique of tone management adjustment technology of the present invention.In other words, illustrate that exactly these image processing systems utilize the method for color separation technology of the present invention.

Can as follows the colored decomposition technique that has increased tone management adjustment technology of the present invention be applied to above-mentioned various applications.

1. in various applications, make for example deep or light modulation parallel operation of visual information processor of each machine have following structure:

(1) the concentration information value that obtains from the colored original image that is recorded on the given recording medium (sensor) of regulation and incide the family curve of the correlationship between the image information value relevant on the above-mentioned recording medium (sensor) from the body that is taken (real image) with light quantity, and based on this family curve, obtain with the concentration dependent image information value of colored original image (comprising hard original copy and soft original copy) and/or the value of electrical signals of image information (analog signal values or digital signal value can) corresponding, the mechanism of the image information value relevant (corresponding to software) with light quantity, and

(2) use above-mentioned＜deep or light accent transform〉mechanism's (corresponding to software)

2. the structure of efferent can adopt and basis＜deep or light accent transform〉calculated value (the i.e. corresponding machine of (Yn value) (size of site) obtained, be used for the current value or the magnitude of voltage of controlling recording device (write head), or conduction time etc., so as to changing the size (size of site) of site, site number in certain area (pixel), the variation of the concentration of the site in certain area etc. itself (promptly, adopt size modified tone method, density modified tone method, deep or light accent explicit representations such as concentration modified tone method etc.), export deep or light mediation tone and be adjusted to desirable half accent (the deep or light accent in site, middle tone) color dub image.

For example, utilize colored decomposition technique of the present invention, make the color printing image master of the deep or light picture of changing the line map in site, when being printing original plate (look domain picture), utilize well-known existing systems in the industry, by colored decomposition technique of the present invention being fused to colored purpose of decomposing in the mechanism such as commercially available electronic color decomposer (color scanner, panchromatic scanner).

More particularly, can utilize following this well-known existing systems, be about to very little focus irradiation to color negative film original image (media image of transmission-type), utilize photoelectric transformer (photomultiplier) to receive transmitted light (image information signal), the power of light is transformed to the power of voltage, utilize computing machine that the image information electric signal (magnitude of voltage) that is obtained is carried out processing and sorting on request, according to what export from computing machine, image information signal (magnitude of voltage) through processing, the light source of control exposure usefulness, with the new film of laser focusing source irradiation, make printing original plate (look domain picture) then.

In this process, be used for the image information electric signal of colored original image (media image) is put in order in the computing portion of the computing machine of processing usefulness, as long as pack a kind of like this software into; Promptly according to being recorded in color negative film (the concentration information value of the colored original image (media image) on the recording medium, utilize the concentration family curve of above-mentioned color negative film (recording medium), obtain the image information value relevant, simultaneously utilization＜deep or light accent transform with light quantity〉software of size (Yn value) of output site.

By above explanation as can be known, utilize the image information input mechanism of scanner, specifically, utilize photoelectric conversion department (photomultiplier) to handle colored original image (shooting is recorded in the media image on the recording medium that is called sensitive photographic material) and obtain and concentration dependent image information value.And, strictly speaking, because above-mentioned photoelectric conversion department also has the family curve (light-to-signal transfer characteristic curve) of itself, therefore, in photoelectric transformer, the information of colored original image also is subjected to the influence (rotten, deterioration) of the light-to-signal transfer characteristic curve of photoelectric transformer.Therefore, had better get rid of the influence of the light-to-signal transfer characteristic curve of above-mentioned photoelectric transformer, but also can ignore its influence.

In other words, the image information of above-mentioned colored original image can be subjected to the influence (rotten, deterioration) of the light-to-signal transfer characteristic curve of above-mentioned photoelectric transformer.Therefore, preferably to get rid of the influence of above-mentioned light-to-signal transfer characteristic curve, but consider characteristic of above-mentioned photoelectric transformer etc., also can ignore its influence.

Above-mentioned software can be the software of various forms, for example according to given concentration family curve, to be transformed into the relevant image information value (Xn) of corresponding with it light value with the concentration dependent concentration information value (Dn) of colored original image, have simultaneously＜deep or light accent transform〉algorithm software, but also have the multi-purpose computer of the I/F (interface) of A/D (simulating a digital conversion), D/A; The general purpose I C that algorithm is pressed logic and Programming with Pascal Language specializes circuit; The circuit that contains the ROM that is useful on the stored algorithm operation result; The PAL that algorithm has been specialized as internal logic; Gate array; Application-specific integrated circuit or the like.

Particularly since recently modular suitable development has been arranged, thereby can be with of the present invention＜deep or light accent transform serve as that the arithmetical organ that the deep or light modulation of image changes is carried out on the basis, can be easy to make special use IC, LSI, microprocessor, microcomputer etc. touch piece.

And, if on one side the optically focused that optoelectronic scanning is used is divided into point, a scan edge; On the other hand, make and utilize laser explosure device and its synchronization action of laser radiation to the new film, then can reasonably produce have by above-mentioned＜deep or light accent transform the deep or light mediation tone transferred of the site of the size (Yn) of the site of deriving is adjusted to the printing original edition plate (look domain picture) of desirable deep or light mediation tone.

Fig. 1 is density characteristic curve (F corporate system) figure of color film.

Fig. 2 is the summary of infrastest of the present invention and the key diagram of employed colored decomposition curve.

Illustrate in greater detail colored decomposition technique deep or light key of the present invention is whole and that the tone adjustment is united below by embodiment.

Below be the embodiment that makes color printing image (duplicating image) according to colored original image (media image), but range of application of the present invention is not limited thereto.

In order to check with of the present invention＜deep or light accent transform〉whether can reasonably manage the deep or light mediation tone of adjusting color printing image as important tool, carried out the experiment in following 3 stages:

(1) infrastest

(2) application experiment

(3) practical application experiment

For cautiously check with the adjustment of tone management add to as deep or light modulation change the technology useful tool＜deep or light accent transform the influence and the effect that are produced, in the experiment in 3 above-mentioned stages, adopted following two kinds of methods to test respectively.

(1) experiment A: the tone management point (M that adjusts 3 look domain pictures (C version/M version/Y version) ₁) and the experiment of the size of the site of two aspects of S portion

(2) experiment B: the M that only adjusts 3 look domain pictures (C version/M version/Y version) ₁The experiment of point

＜M ₁Point, M ₁The light value of point and of all kinds edition definite method〉with the γ value

(1) tone management point (M ₁)

Tone management point (M ₁) (referring to Fig. 3) be set in the prior art the deep or light extensively middle tone of employing of institute of transferring of modulation, more strictly speaking, is that on the C version site the changed the line map site % of picture (look domain picture) is set at 50% point.

It is consistent with the standard value used of the general gray balance of keeping appropriateness that adopts in the industry.

Self-evident, in the present invention, tone management point (M ₁) size that do not limit the site of C version is 50% position.

(2) tone management point (M ₁) light value.

Tone management point (M ₁) light value change curve decision by the C version with the deep or light modulation of colored decomposition curve.

Be about to following condition substitution decision C version usefulness colored decomposition curve＜deep or light accent transform in, obtain X value (light value at tone management point place).

Site usable range: 0～95% (Y _H=0%, Y _S=95%)

γ value: 0.45

X _S=1.00, X _H=0.00 (X _S-X _H=1.00)) (notes)

(this is tone management point (M to Yn=50 (%) ₁) the size of site)

With above-listed condition substitution＜deep or light accent transform〉in, find the solution following formula.Solve X=0.40.

50=0+[(1-10 ^-0.45X) (95-0)/(1-10 ^-0.45)] (notes) common, the dynamic range (X that tries to achieve from colored original image (media image) _S-X _H) not 1.00.But formula has adopted and the dynamic range standard has been turned to 1.00 value.

Certainly, even dynamic range standard is everywhere turned to 1.00, the picture quality content also can change relatively, so what problem does not have yet in Flame Image Process.

(3) definite method of the γ value used with colored decomposition curve of version of all kinds (C/M/Y/BL)

In following test example, as mentioned above, set the colored decomposition curve of C version with the value of γ=0.45.

Other look version must be obtained the γ value of setting colored decomposition curve (deep or light modulation changes curve) usefulness separately respectively according to the content of tone regularization condition.For example, when the M version, at investigation mission outside the city or town management point (M ₁) locate (its light value is 0.40), when the size of the site of M version is 20% and site usable range when being 0～68%, find the solution following formula and get final product.Following formula separate γ=0.20.

20＝0+[(1-10 ^-γ(0.40))(68-0)/(1-10 ^-γ)]

In this experiment, used and to have calculated tone management point (M automatically ₁) the light value and the γ value of version of all kinds usefulness and prepare the software of desirable colored decomposition curve automatically.

The machine that uses in＜the experiment, material 〉

(1) select for use the image of brown pottery of the standard quality of taking as the colored original image with Fuji's color film of 4 " * 5 " of E, K, corporate system.

(2) color digital scanner 455 types that use the ISOMET corporate system are as color scanner, and this scanner has the deep or light modulation parallel operation of the following software of having packed into.

By photo density characteristic curve (having prepared the family curve of representational sensitive photographic materials such as 12 Fuji's colour films, AGFA colour film, Kodak colour film), obtain the software of light value (normalized light value) according to concentration value.

Utilization＜deep or light accent transform〉carry out the software of tone management, and the software that calculates colored decomposition curve.

(3) use AGFA S712P to decompose the film of usefulness as colour.

When (4) carrying out colour correction, adopted Ke Laomalin (the Network ロ マ リ Application) system of DUPO company.

＜infrastest 〉

The purpose of this experiment is to confirm of the present invention＜deep or light accent transform〉whether this instrument have the function of the tone of reasonably adjusting color printing image.

Particularly having confirmed can be while keeping deep or light accent, reasonably carrying out the modulation of tone.

Of all kinds edition the plate-making design data that carries out tone management adjustment usefulness that infrastest is used has been shown in the table 3.

(annotating 1) experiment A is the contrast factor value (Y that specifies S portion earlier _S), use following formula (1) to ask M then ₁The size of the site of point (tone management point).The size of the standard site of following formula (1) is shown in table 2.

M ₁The site % value=(M of point ₁The standard site % value of point) * (to the size of the site of S portion appointment)/(size of the standard site of S portion) ... (1).

(annotating 2) experiment B adopts the value of testing among the A as M ₁The size of the site of point adopts the size of standard value (table 2) as the site of S portion.

(annotating 3) is because selected with the H portion of photography light bright spot part as colored original image (kettle), so all the size of the site of the H portion of look domain picture is " 0 " (zero).

Table 3 (infrastest is used) tone adjustment plate-making design data

Test No.. the look version		Experiment A			Experiment B
								H	M1	S	H	M1	S
		No.1	C	0	50	95	0							50	95
M	0							31(40×70/90＝31.1)	70	0	31	90
			Y	0	36(40×80/90＝35.5)	80	0						36	90
No.2	C							0	50	95	0	50			95
		M	0	27(40×60/90＝26.6)	60	0	27						90
	Y							0	31(40×70/90＝31.1)	70	0	31		90

4 experimental results of above-mentioned experiment, according to plate-making true (experience), the same with expection all.This show utilize of the present invention＜deep or light accent transform the tone management method have rationality.

Theing contents are as follows of 4 colour correction images that obtain from infrastest.

(1) 4 all in whole dynamic ranges of H portion～S portion, reproduced deep or light accent (Gradation) well, and the amount sense of middle tone also is suitable for people's vision.

(2) tone of kettle (belongs to blue series, (among the NO.1～NO.2), be blue serial in the middle tone zone, belong to the brown series of original image in S portion at experiment B at experiment A among the NO.1～NO.2).These tones and reality meet fully.

Therefore, set experiment A (γ value and M that the version of all kinds among the NO.1～NO.2) is used with colored decomposition curve ₁The size (calculated value) of the site of point is as follows:

(1) experiment A (NO.1) C version γ=0.45, M ₁Site % value=50. of point

0000％

M version γ=-0.20, M ₁Site % value=30. of point

9878％

Y version γ=-0.18, M ₁Site % value=35. of point

8678％

(2) experiment B (NO.2) C version γ=0.45, M ₁Site % value=50. of point

0000％

M version γ=0.18, M ₁Site % value=26. of point

9006％

Y version γ=0.20, M ₁Site % value=30. of point

9878％

In addition, the γ value of BL version is γ=-0.25.

The colored decomposition curve (deep or light modulation changes curve) of the version usefulness of using among the summary of above-mentioned infrastest and experiment A (NO.1) and the experiment B (NO.1) of all kinds is shown in Fig. 2.

(a) is in order to keep gray balance, the combination of the colored decomposition curve that adopts as standard in the industry among Fig. 2.Its design data is shown in table 2.

The combination of the colored decomposition curve of version of all kinds (deep or light modulation changes curve) of (A) expression experiment A (NO.1) among Fig. 2, the combination of the colored decomposition curve (deep or light modulation changes curve) of the version of all kinds among the figure among (B) the expression experiment B (NO.1).

＜application experiment 〉

The purpose of this experiment is to carry out colour with the method that more approaches daily colored apportioned effort to decompose experiment, confirms to utilize of the present invention＜deep or light accent transform〉the tone management method whether have the function of reasonably adjusting the tone of managing color printing image.

In this experiment, the size of the site of C domain picture is got 50% point as tone management point (M ₁).

Adopted the site % value appointment above-mentioned tone management point (M of " DIC GRAF-G colour atla " (in March, 1991, the 2nd edition) of big Japanese ink chemical industry society system as the various looks of C/M/Y that utilize domain picture of all kinds ₁) tone located adjusts the basic scale of content (waiting the correction of the tone that requires, the particular content of change by user).

In this experiment, 6 kinds of colors from above-mentioned colour atla, have been selected.

Table 4 shows the appointment site % value of 6 kinds of color and tint adjustment usefulness selecting from above-mentioned " DIC GRAF-G color chart ".

In above-mentioned colour atla, between 0～100, represent above-mentioned 6 kinds of colors as the site concentration of C/M, wherein the color of Y/BL (certain site concentration, as shown in table 4, for example have the color of 10% or 50% site concentration) the overlapping printing of expression with 12 grades.

Therefore the size of the appointment site of tone adjustment usefulness is specified in this colour atla easily, and table 4 has provided the size of this appointment site.

Though be self-evident, the purpose of this experiment is to check color with the big or small appointment of above-mentioned site whether can not cause deep or light accent deterioration and can verily reproduce on look domain picture.

The size of table 4 appointment site of 6 kinds of selected color and tint adjustment usefulness from colour atla

Test No.. look		DIC GRAF-G colour atla					The size of the appointment site of tone adjustment usefulness
											Page	C	M	Y	BL	C	M	Y	BL
		a-1 a-2	Blue and green	17 29	0～100 0～100	0～100 0～100	10 10	10 30	50 50	20 20										10 10	10 30
b-1 b-2	Pale yellow										19 31	0～100 0～100	0～100 0～100	50 50	10 30	50 50	20 20	50 50	10 30
		c-1 c-2	Blue or green pale yellow	24 25	0～100 0～100	0～100 0～100	30 50	20 20	50 50	20 10										30 50	20 20

The version design data of all kinds of this experiment usefulness that makes according to the data in the table 4 is shown in following table 5.

(annotate 1) in this experiment, M ₁The size of the appointment site of point has adopted the size of the appointment site of the tone adjustment usefulness in the table 4 certainly.

In this experiment A, the size of the site of the M/Y version usefulness of S portion is tried to achieve by following formula (2) (annotating 2).

The C version adopts the value (95%) in the table 2 (keeping the gray balance standard value).The size of the standard site of following formula (2) is shown in table 2.When the result of calculation of being obtained by following formula (2) surpasses site big or small, then adopt the size of standard site.

The size of the site of S portion=(size of the standard site of S portion) * (to M ₁The size of the site of some appointment)/(M ₁The size of the site of point) ... (2)

(annotating 3) is owing to the H portion of selected photography light bright spot as colored original image (kettle), so all the size of the site of the H portion of look domain pictures is " 0 " (zero).

(annotating 4) BL version (black print) is according to demarcating the accent mode, and (startingpoint is SP) as M promptly to go up black starting point ₁Point, with terminal point (end point EP) as S portion.

In addition, the size of the maximum site of the BL version that S portion adopts is 80% among the experiment A, is 70% among the experiment B.

Table 5 (application experiment is used) tone adjustment plate-making design data

The result of above-mentioned application experiment is the same with above-mentioned infrastest, fully with envision identical.

Tone management point (M from the acquisition of color dub image ₁) tone of locating is in full accord with the tone on the colour atla of the basic scale of conduct, and in whole dynamic ranges of H portion～S portion, deep or light accent level (also having tone certainly) makes people's vision feel nature.

Promptly, according to the result of above-mentioned application experiment, can confirm with of the present invention＜deep or light accent transform be the colored decomposition technique of instrument, have rationality aspect the management adjustment of carrying out tone.

＜practical application experiment 〉

In this practical application experiment, wait the colored original image of use standard in view of nearest printed design teacher, the processing tune of the color printing image that duplicates dare to be changed into blue cast, strong grene-shade, the pale green tone, pink tone, the operation that Ink sepiellae seu sepiae tone isochrome is transferred increases to some extent, and in view of at present aspect the overall tone that changes above-mentioned image, technical ability fully rule of thumb in existing technology, the present situation that just can finish through the flow chart of many complexity is tested in the validity of adjusting method with the management of corresponding deep or light accent of the present invention of these operations and tone.

That is, use the management of deep or light accent of the present invention and tone and adjust method, totally change the tone of image, reasonably whether to managing image deep or light transferred in and gone affirmation simultaneously.

The colored original image of above-mentioned experiment usefulness is selected from the transmission-type colored original of 4 " * 5 " size of generally acknowledging, thinking the F corporate system that can be used as the standard colored original through the industry.Specifically, as the colored original image, the young women picture that contains multicolour such as red, blue, green, yellow, purple and the image of several base materials (metal, cloth, paper etc.) have been selected.

On the other hand, simultaneously in the industry as testing with reference to 4 " * 5 " transmission-type standard specimen of the AGFA corporate system that is widely used with standard specimen (the colored original image of making by iso standard).

The processing tone of the color printing image that duplicates all becomes blue cast.

Specifically, in the 29th page of DIC GRAF-G colour atla, with C version 50%, M version 30%, Y version 10%, and the bulletin colour of BL version 30% management tone.

The machine that uses in this experiment and data etc. are with above-mentioned identical.

The plate-making design data of this experiment usefulness is shown in table 6.In addition, provided C version tint ramp setting data in the table 7.

When the plate-making design data of establishment in the table 6, with reference to above-mentioned＜application experiment〉result, and considered following problem.

(1) in order to be controlled to Natural color to red, grey, green, yellow, the purple isochrome in the colored original image, makes the processing tune of the blue cast of integral image that certain dynamics is arranged again, fully considered image appearance ability and the effect that the BL version is had neatly.

(2) therefore, the size that the SP of BL version (starting point) is fixed on the site of C version is 10% position, management point (M ₁) be 10%, and the size of the maximum site of S portion gets 95%.In addition, the setting of the colored decomposition curve of BL version with the γ value, promptly＜deep or light accent transform the γ value be 0.10.

Table 6 (the practical application experiment is used) tone adjustment plate-making design data

The look version	H	M1	S	The γ value
					C	5	50	95	γc 0.45
M	3	30	68(90×30/40＝67.5)	γm 0.15
					Y	3	10	23(90×10/40＝22.5)	γv -0.10
BL	-	30	95	γbl 0.10

Table 7 (the practical application experiment is used) C version design data

H＝5％、S＝95％、γc＝0.45

Colored original image (F corporate system standard original copy)

Number of steps	Original copy concentration value (Dn)	Light value (Xn)	Base light value (Xn-XH)	Normalized light value (Y)	The size of site
						1(H)	0.3100	1.3333	0.0000	0.0000	5.0000
2	0.9175	1.9125	0.5792	0.3777	50.1761
						3	1.5250	2.2928	0.9595	0.6257	71.5487
4	2.1325	2.6005	1.2672	0.8263	85.2382
						5(S)	2.7400	2.8668	1.5335	1.0000	95.0000

Two aspects of the deep or light accent of color harmony that experimental result has obtained image predetermined the same color printing image during all with the plate-making design.

That is, the young women character image in the colored original image visually makes the people feel that image totally processes tune and be blue cast, and extremely natural.And it is blue that the overall tone of female character picture is, even and the very thin deep or light accent that original skin color is had under blue color, also can reveal out original skin color fully.According to above-mentioned experimental result, explanation meticulously, then the tone of appointment is same tone in the tune of H portion～middle tone and the colour atla, and the sense of dark red (M) look remaining is arranged in S portion zone.Plate-making design data (data) from table 6 as can be known, this is that experimental result meets therewith fully because the size of many sites in the S portion of M version is to specify (68%).

In addition, each color control such as red, green, yellow, purple gets very soft, and the tune of integral image does not have inharmonious sense.

The overall deep or light accent of H portion～S portion does not a bit all suffer damage, and has shown the peculiar deep or light modulationizations of base material such as metal, cloth, flower on the whole with blue color, therefore these base materials of recognition clearly, and the while, these parts also can be reproduced well.

The color printing image of the blue color that obtains from the AGFA standard specimen, though be the image of blue color generally, but still have abundant deep or light accent.

That is, the tune of experiencing from integral image visually is blue color, yet coordinates equally extremely certainly with the natural scene of seeing by blue egative film.Even this point has confirmed in tone integral transformation process, also can reasonably carry out deep or light transposing.

Colored decomposition technique of the present invention utilizes specific＜deep or light accent transform〉colored decomposition technique, it can be with the deep or light key that is regarded as difficult point in the prior art whole and tone adjustment unite.

The present situation of prior art is, when the market demand high (degree of requirement is high) privileged site, specific part and integral image tone are adjusted (correction of tone, change), not only can not carry out the adjustment of tone quantitatively, and the tone imbalance at this position and other position, the tune of integral image (deep or light mediation tone) not just can not made high-quality color dub image.

In contrast, colored decomposition technique of the present invention adopts specific＜deep or light accent transform 〉, utilization is somebody's turn to do＜deep or light accent transform〉can carry out the whole and tone adjustment of deep or light key fully quantitatively, can conform with the destination colored original image is carried out the colour decomposition, can make the high-quality color dub image that deep or light accent repeatability is good, the tone process is adjusted expeditiously.

That is, Color analysis technology of the present invention has following advantage:

(1) can reasonably adapt to market to height, complexity, the diversified demand of the quality of the color dub images such as color printing image.

(2) since making, particularly the Color analysis operation of color dub image can be quantitatively, reasonably carry out, so have boosting productivity, shorten the activity duration, effectively use equipment, the significant effects such as economical with materials, reduction consumption.

(3) in the making of the color dub images such as color printing image, can open up the road that reasonably effectively utilizes perception and artistry. Everything is so that desired perception and artistry are attached to of the industries such as press becomes possibility in the industrial mode of production, helps the flexibility of the industries such as press and image-related industry.

Claims (6)

1. tone management method of adjustment when making the color dub image of transferring the site, be used for that family curve by recording medium promptly incides the light value on the recording medium and the correlationship curve of the density value that forms on recording medium, it is that transfer the site that the light value of each pixel that the colored original image that will be write down on the given recording medium obtains is transformed into half deep or light tone, make the color dub image, this tone management method of adjustment is characterised in that:

(1) at the i.e. desirable position between the darkest portion of the promptly highlights of the H of colored original image portion～S portion, setting the tone management point that the tone of management color dub image uses is M1;

(2) be M1 at above-mentioned tone management point, the regularization condition of the big or small specified hue of the site of usefulness look version (dark green version, peony version, yellow version and black version);

(3) below the big or small substitution of the size of the site of the look version of light value that is M1 with above-mentioned tone management point and the above-mentioned tone regularization condition of reflection and the desirable site set in H portion and S portion＜deep or light transposing formula, determine the γ value, prepare light value with the pixel of the H portion～S portion of above-mentioned look version become the site size usefulness＜deep or light accent transform;

(4) with the version usefulness of all kinds of determining above-mentioned γ value＜deep or light accent transform, the light value of each pixel of version usefulness of all kinds is carried out deep or light transposing, check colors simultaneously and transfer in the adjustment of line pipe reason.

＜deep or light accent transform 〉

Y _n＝Y _h+[α(1-10 ^-kx)(Y _s-Y _h)/(α-β)]

Should＜dense what is said or talked about transfers transform in the meaning of each symbol as follows:

X: expression (X _n-X _H), represent that promptly any pixel of the colored original image obtained from the family curve that utilizes above-mentioned recording medium is that the concentration information that n is ordered is D _nCorresponding light value is X _nIn the difficult breath value of concentration that deducts by the H portion of the colored original image of obtaining with quadrat method be D _HCorresponding light value is X _HAfter the basic light value that obtains;

Y _n: to the colored original image on pixel arbitrarily be the site size of the pixel on the corresponding color dub image of n point;

Y _h: the size of the site that the H portion on the color dub image corresponding with the H portion on the colored original image is set in advance;

Y _S: the size of the site that the S portion on the color dub image corresponding with the S portion on the colored original image is set in advance;

α: the surface reflectivity of the image appearance medium that the recording colour duplicating image is used;

β: by β=10 ^-γThe numerical value of decision;

K: by K=γ/(X _s-X _H) decision numerical value;

X in the formula _sThe concentration information value of the S portion of the colored original image that expression and the family curve that utilizes above-mentioned recording medium are tried to achieve is D _SCorresponding light value is X _S

2. by the described tone management method of adjustment of claim 1, it is characterized in that: the colored original image is the color negative film original copy of transmission-type.

3. by the described tone management method of adjustment of claim 2, it is characterized in that: the family curve of color negative film original copy recording medium is a sensitization concentration family curve, and it is to be that concentration value, transverse axis are the curves that the rectangular coordinate system of exposure is stipulated with the longitudinal axis.

4. by the described tone management method of adjustment of claim 1, it is characterized in that: the adjustment of tone is that the size of the site of yellow version, black version is fixed, and adjusts the size of the site of dark green version and peony version.

5. by the described tone management method of adjustment of claim 1, it is characterized in that: the tone management point is that M1 is set in according to X _S-X _H=1.0 is normalized light value scope, Y _H=0%, Y _S=95%, the dark green version of the starting condition of the γ=0.45 decision size of changing the site on the curve with deep or light modulation is the point at 50% position.

6. by the described tone management method of adjustment of claim 5, it is characterized by: the tone management point is that M1 is set in promptly the standardize point at position of light value of M1=0.400.

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