CN102019752A - Printing ink colour matching system and method - Google Patents

Abstract

The invention relates to a printing ink colour matching system and method. The system comprises a core database, a converted colour printing ink colour matching processing module and a formula result output module, wherein the core database is used for storing hue, brightness and saturation of single colour base colour printing ink, hue, brightness and saturation of secondary colour PQ formed by blending base colour printing ink in different percentage contents as well as hue, brightness and saturation of secondary colour PQ with different percentage contents of white ink and black ink; the converted colour printing ink colour matching processing module is used for calculating initial hue, initial brightness and initial saturation of secondary colour when the converted colour printing ink is utilized to blend target colour; and the formula result output module is used for determining percentage content and hue shift of white ink and/or black ink required to be added actually in brightness and saturation adjustment and outputting printing ink formula result when hue shift is in tolerance range, otherwise hue of target colour is corrected and calculation is repeated. By using the invention, the accuracy of printing ink colour matching is improved.

Description

The printing ink color matching system and method

Technical field

The present invention relates to the printing-ink color technology, particularly relate to a kind of printing ink color matching system and method based on the photochromic transformation theory of complex frequency spectrum.

Background technology

No matter currently relating to photochromic field, be coloured light technology such as computer demonstration, illumination, or colorant technology such as printing, photography, coating, the main cie color theory of its theoretical foundation.The CIE theory is based on " standard colorimetric observer XYZ tristimulus values ", can not reflect " coloured light " spectral characteristic on whole visible light bands of a spectrum, has problems such as color balance, aberration calculating.Therefore, deficiency is all arranged in the application of every field.

For overcoming the defective of cie color theory, the many benefits of the present inventor Pang, Pang also speed to have proposed a kind of brand-new complex frequency spectrum colourity theory, and be 20071013676.2 at application number, name is called the characterization method that discloses in the Chinese invention patent application of " complex frequency spectrum chromatic diagram and color characteristic Numerical Calculation Method " based on complex frequency spectrum colourity theory, and the disclosed full content of this application for a patent for invention will be incorporated in this as a reference.

On the basis of complex frequency spectrum colourity theory, applicant of the present invention has proposed the brand-new printing ink color matching technical scheme of a cover, and be 200910080925.0 at application number, name is called in the Chinese invention patent application of " complex frequency spectrum printing ink color matching method and system ", disclose the specific implementation method of complex frequency spectrum printing ink color matching system architecture and printing ink color matching, the disclosed full content of this application for a patent for invention also will be incorporated in this as a reference.The applicant has proposed based on complex frequency spectrum printing ink color matching system in this application for a patent for invention, and the form and aspect of the secondary color that can form different printing ink are carried out the form and aspect conversion.For example: the basic printing ink of core data library storage of supposing the system is Essential colour printing ink P, the color feature value of Q, now need not store in the employing system other brand printing ink M of color feature value, N allotment aim colour X, then can try to achieve the required Essential colour printing ink P of allotment aim colour X, Q and corresponding proportioning, and respectively with printing ink M, N is that aim colour is required Essential colour printing ink P, Q and corresponding proportioning, then according to using Essential colour printing ink P, Q allotment aim colour X, printing ink M, during printing ink N, Essential colour printing ink P, the degree of Q calculates and uses printing ink M, printing ink M during N allotment aim colour X, the degree of N.Adopt this technical scheme that the form and aspect of the secondary color of Essential colour printing ink P, N formation are carried out the form and aspect conversion, make in the process that application complex frequency spectrum printing ink color matching system matches colors, the client may use the different brands printing ink of storing in the core database with system, as printing ink M, N, thereby make the general possibility that becomes of the printing ink of different brands, enlarged printing ink range of choice in the printing match color procedure, made things convenient for enterprise to change printing ink supplier, reduced production costs.

The present inventor finds that in putting into practice the process of above-mentioned prior art form and aspect, brightness and saturation degree are to the accuracy important influence of printing ink color matching.Prior art has only considered that the form and aspect of secondary color that different printing ink are formed are carried out the form and aspect conversion in different printing ink color matching transfer processes, and the brightness of the secondary color that different printing ink are formed and the conversion of saturation degree are not all considered, thereby has influenced the degree of accuracy of matching colors.

Summary of the invention

The invention provides a kind of printing ink color matching system and method, when carrying out different Essential colour printing ink conversion based on the theoretical existing printing ink color matching system and method for complex frequency spectrum color matching in order to solve, the defective that the printing ink color matching accuracy is lower.

The invention provides a kind of printing ink color matching system, comprising:

Core database, the form and aspect, brightness and the saturation data that are used for store monochrome Essential colour printing ink P, Q, monochromatic Essential colour printing ink P, Q respectively with chalk, tusche different weight percentage content under form and aspect, brightness and saturation data, form and aspect, brightness and the saturation data of the secondary color PQ that Essential colour printing ink P, Q form with different weight percentage content allotment, and comprise described secondary color PQ respectively with chalk, tusche different weight percentage content under form and aspect, brightness and saturation data; Described chalk comprises removes light dose or water down white;

Conversion color ink color matching processing module, be used for according to the above-mentioned data of described core data library storage and the conversion color ink M that obtains in advance, form and aspect, brightness and the saturation degree of N initial form and aspect, original intensity and the initial saturation degree of secondary color MN when calculating with conversion color ink M, N allotment aim colour X; Wherein, the hue difference of described secondary color PQ is greater than the hue difference of described secondary color MN;

Prescription is output module as a result, be used for according to the above-mentioned data of described core data library storage and initial form and aspect, original intensity and the initial saturation degree of described secondary color MN, when determining that original intensity as described secondary color MN is adjusted to the brightness of aim colour X and the saturation degree variable quantity of the initial saturation degree of described secondary color MN and aim colour X being adjusted to the saturation degree range of tolerable variance that sets in advance, the chalk of actual required interpolation and/or the degree of tusche; Determine the hue shift amount when described secondary color MN determine to add the degree of chalk that described actual needs adds and/or tusche; And judge whether described hue shift amount falls into the range of tolerable variance of the hue shift amount adjustment that sets in advance, and is then to export the ink formulations result, otherwise the conversion color ink color matching processing module that reruns after the form and aspect with the described aim colour X of described hue shift amount correction.

The present invention also provides a kind of printing ink color matching method, comprising:

Step S1: storage in advance comprises first data of form and aspect, brightness and the saturation degree of monochromatic Essential colour printing ink P, Q, comprise monochromatic Essential colour printing ink P, Q respectively with chalk, tusche different weight percentage content under second data of form and aspect, brightness and saturation degree, comprise the 3rd data of form and aspect, brightness and the saturation degree of the secondary color PQ that Essential colour printing ink P, Q form with different weight percentage content allotment, and comprise described secondary color PQ respectively with chalk, tusche different weight percentage content under the 4th data of form and aspect, brightness and saturation degree; Described chalk comprises removes light dose or water down white;

Step S2: according to above-mentioned data and the conversion color ink M that obtains in advance, form and aspect, brightness and the saturation degree of N of storage in advance, initial form and aspect, original intensity and the initial saturation degree of secondary color MN when calculating with conversion color ink M, N allotment aim colour X; When determining that original intensity as described secondary color MN is adjusted to the brightness of aim colour X and the saturation degree variable quantity of the initial saturation degree of described secondary color MN and aim colour X being adjusted to the saturation degree range of tolerable variance that sets in advance, the chalk of actual required interpolation and/or the degree of tusche; Determine the hue shift amount when described secondary color MN determine to add the degree of chalk that described actual needs adds and/or tusche; And judge whether described hue shift amount falls into the range of tolerable variance that the hue shift amount that sets in advance is adjusted, and is then to export the ink formulations result, otherwise with the computing of this step of repetition after the form and aspect of the described aim colour X of described hue shift amount correction; Wherein, the hue difference of described secondary color PQ is greater than the hue difference of described secondary color MN.

The present invention is based on the computability of the photochromic transformation theory midplane of complex frequency spectrum coordinate superior function, utilize the data of existing core database, do not need the corresponding data of conversion color ink is tested in a large number, form and aspect, original intensity and the initial saturation degree of the secondary color in the time of can obtaining with conversion color ink allotment aim colour, and obtain end formulation based on these parameters, therefore being convenient to the user selects for use other the different printing ink of Essential colour printing ink that are different from the core database to match colors, the raising user selects the convenience and the flexibility of printing ink, helps reducing cost.Form and aspect, original intensity and the initial saturation degree of the secondary color when taking all factors into consideration with conversion color ink allotment aim colour X obtain the printing ink color matching prescription in addition, have therefore improved the accuracy of color matching.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

The structural representation of the printing ink color matching system that Fig. 1 provides for one embodiment of the invention;

The structural representation of the conversion color ink color matching processing module that Fig. 2 provides for another embodiment of the present invention;

The flow chart of the printing ink color matching method that Fig. 3 provides for further embodiment of this invention;

The flow chart of the conversion color ink color matching processing method that Fig. 4 provides for further embodiment of this invention.

The specific embodiment

At first implication and the computational methods to the major parameter of the description color that the present invention relates to describe.For the visual directly perceived and convenience calculated, the complex frequency spectrum chromatic diagram adopts the drafting that unites two into one of polar coordinates and rectangular co-ordinate to form.Wherein, the X-axis of rectangular coordinate system and Y-axis had both represented that light source light spectrum power distributed relatively, also represented spectral reflectance factor and spectral-transmission favtor percentage; On polar coordinates, length r represents the length of the radius vector of coloured light complex amplitude (being colouring intensity), and angle θ is the 0-360 degree, is the form and aspect of color, the position of expression color on polar coordinates, one of its key are that visible wavelength range 390nm-780nm is corresponded on the circumference of 360 degree.

Parameter according to the theoretical reflection of complex frequency spectrum colourity color characteristic mainly contains following several:

The C-----colouring intensity, on complex frequency spectrum figure be one with the relevant vector of light momentum probability complex amplitude.The power of representing this color colour developing ability.

The H-----form and aspect are colouring intensity place phase place (0 °-360 °) on complex frequency spectrum figure.Form and aspect are one of important quantizating index of distinct color look looks.

L-----brightness on complex frequency spectrum figure, is represented the bright dark degree of color with the size of hodograph encirclement area.With respect to equal-energy source, it is 0-100 that brightness changes.Brightness here and photopic vision function V (λ) are irrelevant, and be only relevant with spoke brightness e L.

The W-----whiteness, on complex frequency spectrum figure, when vector in colour space is in poised state, the degree of display white.

The S-----saturation degree is a molecule with the colouring intensity light quantity, is denominator with color balance degree light quantity and colouring intensity light quantity sum, the ratio of gained.Its value is 0%-100%.

The v-----basic frequency, the pairing frequency of expression colouring intensity, unit is Hz.

λ-----dominant wavelength, the pairing wavelength of expression colouring intensity, unit is nm.

To a certain printing ink look, the CALCULATION OF PARAMETERS method of its each color characteristic is as follows:

(1) the use spectrophotometer obtains spectral function s (λ) the ρ (λ) of this printing ink, and it is transformed to complex frequency spectrum extremity function r (θ);

Transform method is: according to

Wherein, λ represents wavelength, and s (λ) expression light source relative spectral power distributes, ρ (λ) expression object reflectance factor, and v is a frequency, c is the light velocity, v ₀The red end frequency of expression visible light;

(2) calculate the projection resolute of r (θ) on complex frequency spectrum chromatic diagram four direction; Formula is as follows:

$X_{+}={\∫}_{3\mathrm{\π}/2}^{\mathrm{\π}/2}r\left(\mathrm{\θ}\right)\cos \mathrm{\θd\θ}$

$X_{-}={\∫}_{3/2}^{3\mathrm{\π}/2}r\left(\mathrm{\θ}\right)\cos \mathrm{\θd\θ}$

$Y_{+}={\∫}_0^{\mathrm{\π}}r\left(\mathrm{\θ}\right)\sin \mathrm{\θd\θ}$

$Y_{-}={\∫}_{\mathrm{\π}}^{2\mathrm{\π}}r\left(\mathrm{\θ}\right)\sin \mathrm{\θd\θ}$

(3) calculate the color characteristic parameter based on described projection resolute:

Colouring intensity $C=\sqrt{{{\mathrm{<figure-callout\; id="2"\; label="X\; c"\; filenames="HSA00000271206900013.png"\; state="\{\{state\}\}">X</figure-callout>}}_c}^2+{\mathrm{<figure-callout\; id="2"\; label="Y\; c"\; filenames="HSA00000271206900013.png"\; state="\{\{state\}\}">Y</figure-callout>}}_c^{}}$

Form and aspect $H=\arcsin \frac{Y_c}{C}$ Or $H=\arctan \frac{Y_c}{X_c}$

Brightness $L=\frac{1}{2\mathrm{\&pi;}}{\&Integral;}_0^{2\mathrm{\&pi;}}{r}^2\left(\mathrm{\&theta;}\right)\mathrm{d\&theta;}$

The color balance degree $B_a=\sqrt{{{\mathrm{<figure-callout\; id="2"\; label="X\; Ba"\; filenames="HSA00000271206900013.png"\; state="\{\{state\}\}">X</figure-callout>}}_{\mathrm{Ba}}}^2+{{\mathrm{<figure-callout\; id="2"\; label="Y\; Ba"\; filenames="HSA00000271206900013.png"\; state="\{\{state\}\}">Y</figure-callout>}}_{\mathrm{Ba}}}^2}$

Saturation degree $S=\frac{{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HSA00000271206900013.png"\; state="\{\{state\}\}">C</figure-callout>}}^2}{2{B_a}^2+{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="HSA00000271206900013.png"\; state="\{\{state\}\}">C</figure-callout>}}^2}$

Whiteness W=L (1-S)

Wherein, X _BaBe X ₊And X _-That that middle absolute value is less, X _cBe X ₊And X _-Vector and; Y _BaBe Y ₊And Y _-That that middle absolute value is less, Y _cBe Y ₊And Y _-Vector and.

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not paying the every other embodiment that is obtained under the creative work prerequisite.And the present invention hereinafter relates to each parameter-definition mentioned above and each CALCULATION OF PARAMETERS method will repeat no more." the Essential colour printing ink " that the present invention relates to be when setting up with respect to core database based on printing ink for; " conversion color ink " then is meant other brand printing ink that are different from Essential colour printing ink, also can be described as " self-defined printing ink "; And " secondary color " be meant by wantonly two kinds of colors that printing ink mixes with different weight percentage content, hereinafter repeats no more.

The structural representation of the printing ink color matching system that Fig. 1 provides for one embodiment of the invention.As shown in Figure 1, the printing ink color matching system that provides of present embodiment comprises: core database 11, conversion color ink color matching processing module 12 and prescription be output module 13 as a result.

Core database 11 is used for form and aspect, brightness and the saturation data of store monochrome Essential colour printing ink P, Q, monochromatic Essential colour printing ink P, Q respectively with chalk, tusche different weight percentage content under form and aspect, brightness and saturation data, form and aspect, brightness and the saturation data of the secondary color PQ that Essential colour printing ink P, Q form with different weight percentage content allotment, and comprise described secondary color PQ respectively with chalk, tusche different weight percentage content under form and aspect, brightness and saturation data; Described chalk comprises removes light dose or water down white;

For ease of describing, the present invention might as well be called first data with form and aspect, brightness and the saturation data of monochromatic Essential colour printing ink P, Q; With monochromatic Essential colour printing ink P, Q respectively with chalk, tusche different weight percentage content under form and aspect, brightness and saturation data, be called second data; With Essential colour printing ink P, Q form and aspect, brightness and saturation data, be called the 3rd data with the secondary color PQ of different weight percentage content allotment formation; With described secondary color PQ respectively with chalk, tusche different weight percentage content under form and aspect, brightness and saturation data, be called the 4th data.

According to first data, can obtain initial form and aspect, original intensity and the initial saturation degree of a certain Essential colour printing ink; According to second data, can obtain to a certain monochromatic Essential colour printing ink carry out brightness, when saturation degree is adjusted, the chalk of required interpolation, the degree of tusche; According to the 3rd data, can obtain wantonly two kinds of Essential colour printing ink are allocated the secondary color that obtains by different weight percentage content initial form and aspect, original intensity and initial saturation degree; According to the 4th data, the chalk of required interpolation, the degree of tusche in the time of can obtaining that the secondary color that wantonly two kinds of Essential colour printing ink obtain by the allotment of different weight percentage content carried out brightness and saturation degree adjustment.

Conversion color ink color matching processing module 12 is used for according to the above-mentioned data of core database 11 storages and the conversion color ink M that obtains in advance, the form and aspect of N, initial form and aspect, original intensity and the initial saturation degree of secondary color MN when calculating with conversion color ink M, N allotment aim colour X; Wherein, the hue difference of described secondary color PQ is greater than the hue difference of described secondary color MN.

Prescription output module 13 as a result is used for according to the above-mentioned data of core database 11 storages and initial form and aspect, original intensity and the initial saturation degree of described secondary color MN, when determining that original intensity as described secondary color MN is adjusted to the brightness of aim colour X and the saturation degree variable quantity of the initial saturation degree of described secondary color MN and aim colour X being adjusted to the saturation degree range of tolerable variance that sets in advance, the chalk of actual required interpolation and/or the degree of tusche; Determine the hue shift amount when described secondary color MN determine to add the degree of chalk that described actual needs adds and/or tusche; And judge whether described hue shift amount falls into the range of tolerable variance of the hue shift amount adjustment that sets in advance, be then to export the ink formulations result, otherwise the conversion color ink color matching processing module 12 that reruns after the form and aspect with the described aim colour X of described hue shift amount correction.

The printing ink color matching prescription comprises the degree of conversion color ink M, N, chalk and/or tusche.When the China ink that needs in the printing ink color matching process to add comprised chalk and tusche, the printing ink color matching prescription also can comprise the interpolation order of chalk and tusche, and wherein, chalk specifically can be removes light dose or water down white.

In the technique scheme, arbitrary Essential colour color of ink characteristic parameter of storage can comprise form and aspect, brightness and saturation degree etc. in the core database 11, and each parameter can adopt above that color characteristic CALCULATION OF PARAMETERS method calculates in advance and stores in the core database.In the concrete practice process, can draw a design according to different proportion and by measuring various data by corresponding printing ink.The storage mode of the various data of the present invention is unrestricted, stores as adopting modes such as tables of data or curve.Might as well describe with the example that is generated as of the form and aspect data of the 3rd data Neutral colour PQ: wantonly two kinds of Essential colour printing ink P, Q draw a design according to different proportion, measure and calculate the form and aspect of the color of allotting of drawing a design, and write down measurement result; It is certain particle size that the form and aspect that the ratio of two kinds of Essential colour printing ink changes the back color of allotting change with the hue difference, and specifically granularity can be provided with according to actual needs, as hue difference twice with interior etc.The generation method of other data of core data library storage is similar to said method.The foundation of core database need can be set up on a large amount of bases of measuring and testing.

What conversion color ink color matching processing module 12 actual needs solved is: other printing ink that adopt the Essential colour printing ink different brands of having stored with core database 11, as change color ink M, N, and utilize the corresponding data of the Essential colour printing ink of having stored in the core database, allotment aim colour X.

The benefit that present embodiment is so handled is: present embodiment can utilize the data of existing core database, do not need the corresponding data of conversion color ink is tested in a large number form and aspect, original intensity and the initial saturation degree of the secondary color can obtain with conversion color ink allotment aim colour the time, and obtain end formulation based on these parameters, therefore being convenient to the user selects for use other the different printing ink of Essential colour printing ink that are different from the core database to match colors, the raising user selects the convenience and the flexibility of printing ink, helps reducing cost.Form and aspect, original intensity and the initial saturation degree of the secondary color when taking all factors into consideration with conversion color ink allotment aim colour help improving the accuracy of color matching in addition.

The structural representation of the conversion color ink color matching processing module that Fig. 2 provides for another embodiment of the present invention.The conversion color ink color matching processing module that present embodiment provides can be applicable in the printing ink color matching system of Fig. 1 correspondence.As shown in Figure 2, the conversion color ink color matching processing module that provides of present embodiment can comprise: form and aspect computing unit 121, brightness calculation unit 122 and saturation computation unit 123.

Form and aspect computing unit 121 is used for the initial form and aspect of employing formula (2) and (3) calculating secondary color MN; Brightness calculation unit 122 is used for the original intensity of employing formula (4), (5) or (6) calculating secondary color MN; Saturation computation unit 123 is used for the initial saturation degree of employing formula (7), (8) or (9) calculating secondary color MN.Wherein, formula (2), (3), (4), (5), (6), (7), (8) and (9) will be described in detail among the printing ink color matching method embodiment hereinafter, do not repeat them here.

Need to prove, the division of the above-mentioned concrete unit that conversion color ink color matching processing module comprises only is an embodiment, and the function of different units can be integrated in the unit and realize, perhaps, the function of a unit can be divided into several different subelements, and its specific implementation is unrestricted.

Because form and aspect, brightness and saturation degree are to the accuracy important influence of printing ink color matching, and form and aspect, original intensity and the initial saturation degree of the data computation of the existing core database of present embodiment utilization conversion color ink M, secondary color M, N when N allocates aim colour X, and take all factors into consideration these parameters and obtain end formulation, therefore help improving the accuracy of color matching.

Next will describe the working mechanism of above-mentioned printing ink color matching system and conversion look color matching processing module in detail, and adopt technical scheme provided by the invention can improve the principle of color matching accuracy in conjunction with printing ink color matching method embodiment.

The flow chart of the printing ink color matching method that Fig. 3 provides for further embodiment of this invention.As shown in Figure 3, the printing ink color matching method that provides of present embodiment comprises:

Step S1: storage in advance comprises first data of form and aspect, brightness and the saturation degree of monochromatic Essential colour printing ink P, Q, comprise monochromatic Essential colour printing ink P, Q respectively with chalk, tusche different weight percentage content under second data of form and aspect, brightness and saturation degree, comprise the 3rd data of form and aspect, brightness and the saturation degree of the secondary color PQ that Essential colour printing ink P, Q form with different weight percentage content allotment, and comprise described secondary color PQ respectively with chalk, tusche different weight percentage content under the 4th data of form and aspect, brightness and saturation degree; Described chalk comprises removes light dose or water down white;

Step S2: according to above-mentioned data and the conversion color ink M that obtains in advance, form and aspect, brightness and the saturation degree of N of storage in advance, initial form and aspect, original intensity and the initial saturation degree of secondary color MN when calculating with conversion color ink M, N allotment aim colour X; When determining that original intensity as described secondary color MN is adjusted to the brightness of aim colour X and the saturation degree variable quantity of the initial saturation degree of described secondary color MN and aim colour X being adjusted to the saturation degree range of tolerable variance that sets in advance, the chalk of actual required interpolation and/or the degree of tusche; Determine the hue shift amount when described secondary color MN determine to add the degree of chalk that described actual needs adds and/or tusche; And judge whether described hue shift amount falls into the range of tolerable variance that the hue shift amount that sets in advance is adjusted, and is then to export the ink formulations result, otherwise with the computing of this step of repetition after the form and aspect of the described aim colour X of described hue shift amount correction; Wherein, the hue difference of described secondary color PQ is greater than the hue difference of described secondary color MN.

On the basis of technique scheme, step S2 can specifically comprise step S21-step S26, specifically as shown in Figure 4:

Step S21:, obtain the hue difference of conversion color ink M, N according to the form and aspect of conversion color ink M, N.

This step can adopt following formula to calculate the hue difference of conversion color ink M, N:

|H _M-H _N|＝ΔH _MN (1)

In the following formula (1), H _MBe the form and aspect of conversion color ink M, H _NBe the form and aspect of conversion color ink N, Δ H _MNHue difference for conversion color ink M, N; Wherein, H _M, H _NCan adopt color characteristic CALCULATION OF PARAMETERS method mentioned above to calculate in advance.

Step S22:, determine with conversion color ink M, the secondary color MN transfer colour changing printing ink M of N allotment aim colour X, the degree of N according to described the 3rd data.

This step purpose is to determine turnover colour changing printing ink M, the secondary color MN transfer colour changing printing ink M of N allotment aim colour X, the degree of N.Specifically can be according to the 3rd data, when determining to allocate secondary color respectively with form and aspect of changing color ink M, N and aim colour X with Essential colour printing ink P, Q, each required Essential colour printing ink P, the degree of Q; According to these degrees that obtain, determine with conversion color ink M, the secondary color MN transfer colour changing printing ink M of N allotment aim colour X, the degree of N.

The form and aspect of aim colour X can adopt color characteristic CALCULATION OF PARAMETERS method mentioned above to calculate in advance.In order to improve the success rate of color matching, the form and aspect of match colors required use conversion color ink M, N are between the form and aspect of Essential colour printing ink P, Q; The form and aspect of aim colour are between the form and aspect of conversion color ink M, N.

In the core database of printing ink color matching system, comprise Essential colour printing ink P, Q form and aspect data in advance in Cun Chu the 3rd data with the secondary color PQ of different weight percentage content allotment formation, these form and aspect data can adopt the mode of tables of data or curve to store, other data storage methods that the present invention relates to are similar, repeat no more.When adopting curve to represent these form and aspect data, the ordinate of curve is the form and aspect that printing ink adopts P, Q to allocate the secondary color PQ that obtains by different proportion, the degree of a certain printing ink P or Q among the abscissa secondary color PQ.By searching this curve, the degree of the degree of the degree, form and aspect that can determine Essential colour printing ink P and Q when form and aspect are the form and aspect of aim colour X Essential colour printing ink P and Q during and form and aspect Essential colour printing ink P and Q during for the form and aspect of conversion color ink N for the form and aspect of conversion color ink M.After obtaining these degrees, in the time of can adopting following formula (2) and (3) to calculate with conversion color ink M, N allotment aim colour X, required conversion color ink M, the degree of N:

XM＝(XQ×NP-XP×NQ)/(NP×MQ-NQ×MP) (2)

XN＝(XQ×MP-XP×MQ)/(NQ×MP-NP×MQ) (3)

Wherein, XP and XQ are respectively the P-Q content with Essential colour printing ink P, Q allotment aim colour X, and XP+XQ=100%; MP and MQ are respectively the P-Q content with Essential colour printing ink P, Q allotment conversion color ink M, and MP+MQ=100%; NP and NQ are respectively the P-Q content with Essential colour printing ink P, Q allotment conversion color ink N, and NP+NQ=100%; XM and XN are respectively the M-N content with conversion color ink M, N allotment aim colour X, and XM+XN=100%.

Step S23:, calculate original intensity and the initial saturation degree of described secondary color MN according to brightness and saturation degree and described first data and the 3rd data of the brightness of the hue difference of conversion color ink M, N, described conversion color ink M, N and saturation degree, described Essential colour printing ink P, Q.

The degree of Essential colour printing ink P, Q when this step can be according to the brightness of the brightness of the hue difference of conversion color ink M, N, the conversion color ink M, the N that obtain in advance, the Essential colour printing ink P, the Q that obtain in advance and with Essential colour printing ink P, Q allotment aim colour X calculates with conversion color ink M, the original intensity of secondary color MN when N allocates aim colour X.

The brightness of Essential colour printing ink P, Q can adopt color characteristic CALCULATION OF PARAMETERS method mentioned above to calculate in advance and store in the core database, and the brightness of conversion color ink M, N can adopt color characteristic CALCULATION OF PARAMETERS method mentioned above to calculate in advance.According to the form and aspect extent of conversion look M, N, can adopt diverse ways to calculate the original intensity of allocating the secondary color MN of aim colour X with conversion color ink M, N, specific as follows:

(1) as Δ H _MNIn the time of 〉=150 °, can adopt following formula (4) to calculate the original intensity of secondary color MN:

L _MN＝L _PQ+(L _M-L _P)×(1-XN)+(L _N-L _Q)×XN (4)

(2) as Δ H _MNIn the time of＜55 °, can adopt following formula (5) to calculate the original intensity of secondary color MN:

L _MN＝(L _N-L _M)×XN+L _M (5)

(3) as 55 °≤Δ H _MNIn the time of＜150 °, can adopt following formula (6) to calculate the original intensity of secondary color MN:

L _MN＝{[L _P+(L _M-L _P)×(1-XN)+(L _N-L _Q)×XN]+[(L _N-L _M)×XN+L _M]}/2(6)

In following formula (4), (5) and (6), the degree of secondary color MN transfer colour changing printing ink N when XN changes color ink M, N allotment aim colour X for using, (1-XN) be the degree of the secondary color MN transfer colour changing printing ink M when using conversion color ink M, N allotment aim colour X, L _MBe the brightness of conversion color ink M, L _NBe the brightness of conversion color ink N, L _PBe the brightness of Essential colour printing ink P, L _QBe the brightness of Essential colour printing ink N, L _PQFor allocate the brightness of the secondary color PQ of aim colour X, L with Essential colour printing ink P, Q _MNFor allocate the original intensity of the secondary color MN of aim colour X with conversion color ink M, N.Wherein, L _MBe the brightness of conversion color ink M, L _NBe the brightness of conversion color ink N, L _P, L _QAnd L _PQValue can adopt color characteristic CALCULATION OF PARAMETERS method mentioned above to calculate in advance and be stored in the core database L _MAnd L _NValue can adopt color characteristic CALCULATION OF PARAMETERS method mentioned above to calculate in advance.

In addition, the degree of Essential colour printing ink P, Q calculated the initial saturation degree of allocating the secondary color MN of aim colour X with conversion color ink M, N when this step also can be according to the saturation degree of the saturation degree of the hue difference of conversion color ink M, N, the conversion color ink M, the N that obtain in advance, the Essential colour printing ink P, the Q that obtain in advance and with Essential colour printing ink P, Q allotment aim colour X.

The saturation degree of Essential colour printing ink P, Q can adopt color characteristic CALCULATION OF PARAMETERS method mentioned above to calculate in advance and store in the core database, and the saturation degree of conversion color ink M, N can adopt color characteristic CALCULATION OF PARAMETERS method mentioned above to calculate in advance.According to the form and aspect extent of conversion look M, N, can adopt diverse ways to calculate the initial saturation degree of allocating the secondary color MN of aim colour X with conversion color ink M, N, specific as follows:

(1) as Δ H _MNIn the time of 〉=150 °, can adopt following formula (7) to calculate the initial saturation degree of secondary color MN:

S _MN＝S _PQ+(S _M-S _P)×(1-XN)+(S _N-S _Q)×XN (7)

(2) as Δ H _MNIn the time of＜55 °, can adopt following formula (8) to calculate the initial saturation degree of secondary color MN:

S _MN＝(S _N-S _M)×XN+S _M (8)

(3) as 55 °≤Δ H _MNIn the time of＜150 °, can adopt following formula (9) to calculate the initial saturation degree of secondary color MN:

S _MN＝{[S _P+(S _M-S _P)×(1-XN)+(S _N-S _Q)×XN]+[(S _N-S _M)×XN+S _M]}/2(9)

In following formula (7), (8) and (9), the degree of secondary color MN transfer colour changing printing ink N when XN changes color ink M, N allotment aim colour X for using, (1-XN) be the degree of the secondary color MN transfer colour changing printing ink M when using conversion color ink M, N allotment aim colour X, S _MBe the saturation degree of conversion color ink M, S _NBe the saturation degree of conversion color ink N, S _PBe the saturation degree of Essential colour printing ink P, S _QBe the saturation degree of Essential colour printing ink N, S _PQThe saturation degree of secondary color PQ during for usefulness Essential colour printing ink P, Q allotment aim colour X, S _MNThe initial saturation degree of secondary color MN when changing color ink M, N allotment aim colour for using.Wherein, S _MBe the saturation degree of conversion color ink M, S _NBe the saturation degree of conversion color ink N, S _P, S _QAnd S _PQValue can adopt color characteristic CALCULATION OF PARAMETERS method mentioned above to calculate in advance and be stored in the core database S _MAnd S _NValue can adopt color characteristic CALCULATION OF PARAMETERS method mentioned above to calculate in advance.

Step S24: the brightness variable quantity and the saturation degree variable quantity that calculate described secondary color MN and aim colour X; According to brightness variable quantity, saturation degree variable quantity and described second data and the 4th data, when determining that brightness as described secondary color MN is adjusted to the brightness of aim colour X and the saturation degree variable quantity of the saturation degree of described secondary color MN and aim colour X being adjusted to the saturation degree range of tolerable variance that sets in advance, the chalk of actual required interpolation and/or the degree of tusche.

Further, step S24 can comprise step S241 and step S242.

Step S241: the brightness variable quantity that calculates secondary color MN and aim colour X; According to brightness variable quantity, described second data and the 4th data, determine that when the brightness with secondary color MN is adjusted to the brightness of aim colour X the chalk of required interpolation or the degree of tusche, described chalk comprise removes light dose or water down white.

Concrete, can adopt following formula (10) to calculate the brightness variable quantity of secondary color MN and aim colour X:

ΔL＝L _MN-L _X (10)

In the following formula (10), L _MNThe original intensity of secondary color MN when changing color ink M, N allotment aim colour X for using, L _XBe the brightness of aim colour X, Δ L is the brightness variable quantity of secondary color MN and aim colour X.If Δ L＞0 illustrates the original intensity that needs to reduce secondary color MN, can add the tusche of certain percentage content; If Δ L＜0 illustrates the original intensity that needs to improve secondary color MN, can add the chalk of certain percentage content.

Step S242: the saturation degree variable quantity that calculates secondary color MN and aim colour X; Adjust the degree and described the 4th data of the chalk and/or the tusche of required interpolation according to saturation degree variable quantity, the definite brightness of step S241, when determining that brightness as secondary color MN is adjusted to the brightness of aim colour X and the saturation degree variable quantity of the saturation degree of secondary color MN and aim colour X being adjusted to the saturation degree range of tolerable variance that sets in advance, the chalk of actual required interpolation and/or the degree of tusche.

This step main purpose is by taking all factors into consideration saturation degree variable quantity and brightness variable quantity, determine secondary color MN with conversion color ink M, N allotment aim colour X, the chalk of actual required interpolation and/or the degree of tusche, thereby make adjusted brightness of secondary color MN and saturation degree, identical with the brightness of aim colour X respectively or suitable with saturation degree.

Concrete, can adopt following formula (11) to calculate the saturation degree variable quantity of secondary color MN and aim colour X:

ΔS＝S _MN-S _X (11)

In the following formula (11), S _MNBe the initial saturation degree of allocating the secondary color MN of aim colour X, S with conversion color ink M, N _XBe the saturation degree of aim colour X, Δ S is the saturation degree variable quantity of secondary color MN and aim colour X.When determining whether that according to the saturation degree variable quantity needs are adjusted the initial saturation degree of secondary color MN, can comprise following several situation:

(1) as Δ S ₂≤ Δ S≤Δ S ₁The time, do not need to adjust the saturation degree of secondary color MN, wherein, Δ S ₁For the saturation degree that sets in advance is adjusted first tolerance and Δ S ₁＞0, Δ S ₂For the saturation degree that sets in advance is adjusted second tolerance and Δ S ₂＜0, [Δ S ₂, Δ S ₁] range of tolerable variance adjusted for saturation degree.

The basic principle of adjusting secondary color MN saturation degree is: the saturation degree that makes secondary color MN is as far as possible near the saturation degree of aim colour X.In the printing ink color matching process, can reduce the saturation degree of secondary color MN by the tusche that adds certain percentage content; But be difficult to realize improving the saturation degree of a certain color usually.

In the application in practice process, can set in advance saturation degree and adjust the first tolerance Δ S according to the sensitivity of human eye vision to aberration ₁Adjust the second tolerance Δ S with saturation degree ₂, [Δ S ₂, Δ S ₁] range of tolerable variance adjusted for saturation degree.When saturation degree variation delta S falls into the range of tolerable variance that saturation degree is adjusted, then can think secondary color MN saturation degree and aim colour X saturation degree quite or identical, do not need to adjust the saturation degree of secondary color MN under this situation.When the range of tolerable variance of saturation degree adjustment is set, for example: can be with Δ S ₁Setting in advance is 1%～6%, with Δ S ₂Set in advance and be-6%～-1%; Poor in order to reduce color matching, improve the color matching accuracy, preferred, with Δ S ₁Setting in advance is 1%, with Δ S ₂Set in advance and be-1%.

(2) as Δ S＜Δ S ₂＜0 o'clock, the result that output can't be matched colors.

Because in the printing ink color matching process, the saturation degree of a certain color can not increase usually, can only reduce.Therefore, as Δ S＜Δ S ₂＜0 o'clock, the saturation degree with the secondary color MN of conversion color ink M, N allotment is described, differ greatly with the saturation degree of aim colour X, it is inaccurate to match colors, therefore, the exportable result that can't match colors under this situation.

(3) as Δ S＞Δ S ₁＞0 o'clock, determine under the form and aspect of aim colour X, when the saturation degree of secondary color MN is adjusted to the range of tolerable variance that saturation degree adjusts, the degree of the tusche of required interpolation.

Store the 3rd corresponding relation between saturation degree variable quantity under a certain form and aspect and tusche degree in the core database in advance.After adopting following formula (11) to calculate Δ S, in the inquiry core database, the 4th corresponding relation between saturation degree variable quantity under the form and aspect of aim colour X and tusche degree, in the time of can determining that saturation degree variation delta S is adjusted to the range of tolerable variance that saturation degree adjusts, need the degree of the tusche that adds.

Owing to add the tusche of certain percentage content, can cause the brightness of a certain color and saturation degree all can change.Therefore, during the degree of the tusche that the secondary color MN actual needs when determining with conversion color ink M, N allotment aim colour X adds, need take all factors into consideration chalk or tusche degree and the definite tusche degree of this step S242 that above-mentioned steps S241 determines, for example: reduce saturation degree by adding tusche, if cause the brightness of brightness to reduce owing to add tusche, then can be by carrying out luminance compensation at the interpolation chalk; So adjust the chalk of actual needs increase and/or the percent of total content of tusche repeatedly, and the interpolation of chalk and tusche order, brightness until adjusted secondary color MN equals the brightness of aim colour X and the saturation degree variable quantity of adjusted secondary color MN and aim colour X, falls into the range of tolerable variance of the saturation degree adjustment that sets in advance.

Step S25: according to the chalk of the required interpolation of determining of described reality and/or the degree and described the 4th data of tusche, the hue shift amount the when chalk that the described actual needs of definite interpolation adds and/or the degree of tusche.

Behind the degree of chalk that the actual needs of determining according to step S242 adds and/or tusche, can search the 4th data that core database is stored in advance, can obtain under the form and aspect of aim colour X, add the hue shift amount behind the degree of so many chalks and/or tusche.

Step S26: with the form and aspect of the definite hue shift amount revise goal look X of step S25, the color that will have revised form and aspect is as fresh target look repeated execution of steps S22-step S25, when the definite hue shift amount of step S25 falls into the range of tolerable variance of the form and aspect adjustment that sets in advance, export described printing ink color matching prescription.

In the application in practice process, can set in advance form and aspect and adjust the first tolerance Δ H according to the sensitivity of human eye vision to aberration ₁Adjust the second tolerance Δ H with form and aspect ₂, [Δ H ₂, Δ H ₁] range of tolerable variance adjusted for form and aspect.When hue shift amount Δ H falls into range of tolerable variance [the Δ H that form and aspect are adjusted ₂, Δ H ₁] time, then can think under the form and aspect of aim colour X according to step 241 definite chalk and tusche ground interpolation order, the hue shift amount of adding behind the degree of chalk that actual needs that step 241 determines adds and/or tusche can be ignored, and the form and aspect of the form and aspect of the color that mixes and aim colour X quite or identical.

When the range of tolerable variance of form and aspect adjustment is set, for example: in order to reduce the color matching aberration, improve the color matching accuracy, can be with Δ H ₁Setting in advance is 1 °～8 °, with Δ H ₂Set in advance and be-8 °～-1 °; Preferably, with Δ H ₁Setting in advance is 1 °, with Δ H ₂Set in advance and be-1 °.

Following formula is the example of filling a prescription with conversion color ink M, one when N allocates aim colour X:

(XM+XN) * (1-chalk %-tusche %)+chalk %+ tusche %=1 (12)

In the following formula (12), XM and XN are respectively the M-N content with conversion color ink M, N allotment aim colour X, and XM+XN=100%; Chalk % is the degree of the chalk of actual needs interpolation, can be specially removing light ink or watering down white degree of actual needs interpolation; Tusche % is the degree of the tusche of actual needs interpolation; " chalk % " is positioned at the left side of " tusche % " in the following formula (12), and the interpolation of expression chalk and tusche is in proper order: add tusche after adding chalk earlier.Need to prove that this example only is giving an example of a prescription, actual prescription can adopt other expression mode, should not be construed as the restriction to the technology of the present invention essence.

Range of tolerable variance [the Δ H that exceeds the form and aspect adjustment that sets in advance as hue shift amount Δ H ₂, Δ H ₁] time, can adopt the form and aspect of following formula (13) revise goal look X:

H _X′＝H _X+ΔH (13)

In the following formula (13), H _XBe the form and aspect of aim colour X, Δ H is the hue shift amount, H _{X '}Form and aspect for the fresh target look.

After adopting the hue shift amount that the form and aspect of aim colour X are revised, be equivalent to redefine aim colour, i.e. fresh target look X '.But repeated execution of steps S22-step S25 one or many under this situation, all adopt respective formula during each execution in step S22-step S25, calculate constituent content, original intensity and initial saturation degree with required conversion color ink M, N of conversion color ink M, N allotment aim colour X ', determine chalk and/or the degree of tusche and the interpolation order of chalk and tusche that actual needs adds according to brightness variable quantity and saturation degree variable quantity, and determine to add hue shift amount behind so many chalks and/or the tusche in proper order according to this.If the hue shift amount falls into the range of tolerable variance that form and aspect are adjusted, then the output prescription is promptly exported with the degree of degree, chalk and/or the tusche of changing color ink M, N allotment aim colour X ' required conversion color ink M, N and the interpolation order of chalk and tusche.If the hue shift amount exceeds the range of tolerable variance that form and aspect are adjusted, then adopt the form and aspect of this hue shift amount correction fresh target look X ', with the revised color of form and aspect as another fresh target look X "; adopt said method to calculate once more ... so circulation; when the last hue shift amount of determining fell into the range of tolerable variance that form and aspect adjust, output is prescription accordingly.

Form and aspect, brightness and the saturation degree of secondary color M, N when the present invention utilizes the data computation of existing core database conversion color ink M, N allotment aim colour X, and take all factors into consideration these parameters and obtain end formulation, this end formulation is for prior art is only considered prescription that form and aspect are converted to, improved the accuracy of color matching, it is as follows below the present invention to be improved the principle analysis of color matching accuracy:

Because core database is based on the printing ink of some brand, set up as Essential colour printing ink P, Q, and the ink type difference that printing enterprise uses, the product that wants to match colors is widely used in the different printing ink of various brands, each batch, just accomplish to match colors product and printing ink brand independence just need be set up a cover conversion plan between different printing ink.

Prior art has only considered that the form and aspect of secondary color that different printing ink are formed are carried out the form and aspect conversion in different printing ink color matching transfer processes, and the brightness of the secondary color that different printing ink are formed and all not considerations of conversion of saturation degree.But form and aspect, brightness and saturation degree are to the accuracy important influence of printing ink color matching, and therefore, prior art has only considered the form and aspect of the secondary color of different printing ink formation are carried out the color matching accuracy deficiency of the conversion color ink color matching method of form and aspect conversion.

The inventor finds in putting into practice the process of prior art, consider brightness and saturation degree if desired, a kind of feasible approximate way is: will allocate original intensity and the initial saturation degree of the secondary color PQ of aim colour with Essential colour printing ink P, Q, the original intensity and the initial saturation degree of directly allocating the secondary color MN of aim colour X as turnover colour changing printing ink M, N.But check by actual measurement, the accuracy of this method color matching is still lower, its reason is: because the hue difference of conversion color ink M, N is less than the hue difference of Essential colour printing ink P, Q, therefore, conversion color ink M, N form the combined coefficient of secondary color MN, will be higher than the efficient that Essential colour printing ink P, Q form secondary color PQ in theory; And, brightness and the saturation degree of conversion color ink M, N, brightness and the saturation degree with Essential colour printing ink P, Q is different respectively.So, to allocate original intensity and the initial saturation degree of the secondary color PQ of aim colour with Essential colour printing ink P, Q, directly as original intensity and initial saturation degree with the secondary color MN that changes color ink M, N allotment aim colour X, error will inevitably occur, this conclusion is the checking by the actual analysis result of drawing a design also.

And the present invention is based on the computability of the photochromic transformation theory midplane of complex frequency spectrum coordinate superior function, utilize the data of existing core database, do not need the corresponding data of conversion color ink is tested in a large number, form and aspect, original intensity and the initial saturation degree of the secondary color in the time of can obtaining with conversion color ink allotment aim colour, and obtain end formulation based on these parameters, therefore being convenient to the user selects for use other the different printing ink of Essential colour printing ink that are different from the core database to match colors, the raising user selects the convenience and the flexibility of printing ink, helps reducing cost.Form and aspect, original intensity and the initial saturation degree of the secondary color when taking all factors into consideration with conversion color ink allotment aim colour X obtain the printing ink color matching prescription in addition, have therefore improved the accuracy of color matching.

In addition, adopt technical scheme provided by the invention to carry out printing ink color matching, can compatible existing standard aberration Δ E _LabAberration estimate on the basis, increase the aberration evaluation method of hue difference, luminance difference and/or saturation degree difference, can provide the reason that causes aberration qualitative, quantitatively, as the reason that causes aberration is hue difference Δ H, luminance difference Δ L and/or saturation degree difference Δ S, therefore be convenient to accurately carry out the aberration correction, thereby help improving the efficient of printing ink color matching.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of programmed instruction, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of embodiment of the invention technical scheme.

Claims (10)

1. a printing ink color matching system is characterized in that, comprising:

Core database, the form and aspect, brightness and the saturation data that are used for store monochrome Essential colour printing ink P, Q, monochromatic Essential colour printing ink P, Q respectively with chalk, tusche different weight percentage content under form and aspect, brightness and saturation data, form and aspect, brightness and the saturation data of the secondary color PQ that Essential colour printing ink P, Q form with different weight percentage content allotment, and comprise described secondary color PQ respectively with chalk, tusche different weight percentage content under form and aspect, brightness and saturation data; Described chalk comprises removes light dose or water down white;

Conversion color ink color matching processing module, be used for according to the above-mentioned data of described core data library storage and the conversion color ink M that obtains in advance, form and aspect, brightness and the saturation degree of N initial form and aspect, original intensity and the initial saturation degree of secondary color MN when calculating with conversion color ink M, N allotment aim colour X; Wherein, the hue difference of described secondary color PQ is greater than the hue difference of described secondary color MN;

Prescription is output module as a result, be used for according to the above-mentioned data of described core data library storage and initial form and aspect, original intensity and the initial saturation degree of described secondary color MN, when determining that original intensity as described secondary color MN is adjusted to the brightness of aim colour X and the saturation degree variable quantity of the initial saturation degree of described secondary color MN and aim colour X being adjusted to the saturation degree range of tolerable variance that sets in advance, the chalk of actual required interpolation and/or the degree of tusche; Determine the hue shift amount when described secondary color MN determine to add the degree of chalk that described actual needs adds and/or tusche; And judge whether described hue shift amount falls into the range of tolerable variance of the hue shift amount adjustment that sets in advance, and is then to export the ink formulations result, otherwise the conversion color ink color matching processing module that reruns after the form and aspect with the described aim colour X of described hue shift amount correction.

2. system according to claim 1 is characterized in that, described conversion color ink color matching processing module comprises: form and aspect computing unit, brightness calculation unit and saturation computation unit;

Described form and aspect computing unit is used to adopt following formula to calculate the initial form and aspect of described secondary color MN:

XM＝(XQ×NP-XP×NQ)/(NP×MQ-NQ×MP)

XN＝(XQ×MP-XP×MQ)/(NQ×MP-NP×MQ)

Wherein, XP and XQ are respectively the P-Q content with Essential colour printing ink P, Q allotment aim colour X, and XP+XQ=100%; MP and MQ are respectively the P-Q content with Essential colour printing ink P, Q allotment conversion color ink M, and MP+MQ=100%; NP and NQ are respectively the P-Q content with Essential colour printing ink P, Q allotment conversion color ink N, and NP+NQ=100%; XM and XN are respectively M-N content among the described secondary color MN, and XM+XN=100%;

Described brightness calculation unit is used for as Δ H _MNIn the time of 〉=150 °, adopt following formula to calculate the original intensity of described secondary color MN:

L _MN＝L _PQ+(L _M-L _P)×(1-XN)+(L _N-L _Q)×XN；

As Δ H _MNIn the time of＜55 °, adopt following formula to calculate the original intensity of described secondary color MN:

L _MN＝(L _N-L _M)×XN+L _M；

As 55 °≤Δ H _MNIn the time of＜150 °, adopt following formula to calculate the original intensity of described secondary color MN:

L _MN＝{[L _P+(L _M-L _P)×(1-XN)+(L _N-L _Q)×XN]+[(L _N-L _M)×XQ+L _M]}/2；

Wherein, the degree of the secondary color MN transfer colour changing printing ink N when XN changes color ink M, N allotment aim colour X for using, L _MBe the brightness of conversion color ink M, L _NBe the brightness of conversion color ink N, L _PBe the brightness of Essential colour printing ink P, L _QBe the brightness of Essential colour printing ink N, L _PQFor allocate the brightness of the secondary color PQ of aim colour X, L with Essential colour printing ink P, Q _MNOriginal intensity for described secondary color MN;

Described saturation computation unit is used for as Δ H _MNIn the time of 〉=150 °, adopt following formula to calculate the initial saturation degree of described secondary color MN:

S _MN＝S _PQ+(S _M-S _P)×(1-XN)+(S _N-S _Q)×XN；

As Δ H _MNIn the time of＜55 °, adopt following formula to calculate the initial saturation degree of described secondary color MN:

S _MN＝(S _N-S _M)×XN+S _M；

As 55 °≤Δ H _MNIn the time of＜150 °, adopt following formula to calculate the initial saturation degree of described secondary color MN:

S _MN＝{[S _P+(S _M-S _P)×(1-XN)+(S _N-S _Q)×XN]+[(S _N-S _M)×XN+S _M]}/2；

Wherein, S _MBe the saturation degree of conversion color ink M, S _NBe the saturation degree of conversion color ink N, S _PBe the saturation degree of Essential colour printing ink P, S _QBe the saturation degree of Essential colour printing ink N, S _PQThe saturation degree of secondary color PQ during for usefulness Essential colour printing ink P, Q allotment aim colour X, S _MNInitial saturation degree for described secondary color MN.

3. a printing ink color matching method is characterized in that, comprising:

Step S1: storage in advance comprises first data of form and aspect, brightness and the saturation degree of monochromatic Essential colour printing ink P, Q, comprise monochromatic Essential colour printing ink P, Q respectively with chalk, tusche different weight percentage content under second data of form and aspect, brightness and saturation degree, comprise the 3rd data of form and aspect, brightness and the saturation degree of the secondary color PQ that Essential colour printing ink P, Q form with different weight percentage content allotment, and comprise described secondary color PQ respectively with chalk, tusche different weight percentage content under the 4th data of form and aspect, brightness and saturation degree; Described chalk comprises removes light dose or water down white;

Step S2: according to above-mentioned data and the conversion color ink M that obtains in advance, form and aspect, brightness and the saturation degree of N of storage in advance, initial form and aspect, original intensity and the initial saturation degree of secondary color MN when calculating with conversion color ink M, N allotment aim colour X; When determining that original intensity as described secondary color MN is adjusted to the brightness of aim colour X and the saturation degree variable quantity of the initial saturation degree of described secondary color MN and aim colour X being adjusted to the saturation degree range of tolerable variance that sets in advance, the chalk of actual required interpolation and/or the degree of tusche; Determine the hue shift amount when described secondary color MN determine to add the degree of chalk that described actual needs adds and/or tusche; And judge whether described hue shift amount falls into the range of tolerable variance that the hue shift amount that sets in advance is adjusted, and is then to export the ink formulations result, otherwise with the computing of this step of repetition after the form and aspect of the described aim colour X of described hue shift amount correction; Wherein, the hue difference of described secondary color PQ is greater than the hue difference of described secondary color MN.

4. method according to claim 3 is characterized in that, described step S2 comprises:

Step S21:, obtain the hue difference of conversion color ink M, N according to the form and aspect of described conversion color ink M, N;

Step S22:, determine with conversion color ink M, the secondary color MN transfer colour changing printing ink M of N allotment aim colour X, the degree of N according to described the 3rd data;

Step S23:, calculate original intensity and the initial saturation degree of described secondary color MN according to conversion color ink M, the hue difference of N, brightness and saturation degree and described first data and the 3rd data of described conversion color ink M, N;

Step S24: the brightness variable quantity and the saturation degree variable quantity that calculate described secondary color MN and aim colour X; According to brightness variable quantity, saturation degree variable quantity and described second data and the 4th data, when determining that brightness as described secondary color MN is adjusted to the brightness of aim colour X and the saturation degree variable quantity of the saturation degree of described secondary color MN and aim colour X being adjusted to the saturation degree range of tolerable variance that sets in advance, the chalk of actual required interpolation and/or the degree of tusche;

Step S25: according to the chalk of the required interpolation of determining of described reality and/or the degree and described the 4th data of tusche, the hue shift amount the when chalk that the described actual needs of definite interpolation adds and/or the degree of tusche;

Step S26: with the form and aspect of the definite hue shift amount revise goal look X of step S25, the color that will have revised form and aspect is as fresh target look repeated execution of steps S22-step S25, when the definite hue shift amount of step S25 falls into the range of tolerable variance of the form and aspect adjustment that sets in advance, export described printing ink color matching prescription.

5. method according to claim 4 is characterized in that, adopts following formula to determine the degree of described secondary color MN transfer colour changing printing ink M, N among the described step S23:

XM＝(XQ×NP-XP×NQ)/(NP×MQ-NQ×MP)

XN＝(XQ×MP-XP×MQ)/(NQ×MP-NP×MQ)

Wherein, XP and XQ are respectively the P-Q content with Essential colour printing ink P, Q allotment aim colour X, and XP+XQ=100%; MP and MQ are respectively the P-Q content with Essential colour printing ink P, Q allotment conversion color ink M, and MP+MQ=100%; NP and NQ are respectively the P-Q content with Essential colour printing ink P, Q allotment conversion color ink N, and NP+NQ=100%; XM and XN are respectively M-N content among the described secondary color MN, and XM+XN=100%.

6. method according to claim 4 is characterized in that, calculates the original intensity of described secondary color MN among the described step S3, comprising:

As Δ H _MNIn the time of 〉=150 °, adopt following formula to calculate the original intensity of described secondary color MN:

L _MN＝L _PQ+(L _M-L _P)×(1-XN)+(L _N-L _Q)×XN；

As Δ H _MNIn the time of＜55 °, adopt following formula to calculate the original intensity of described secondary color MN:

L _MN＝(L _N-L _M)×XN+L _M；

As 55 °≤Δ H _MNIn the time of＜150 °, adopt following formula to calculate the original intensity of described secondary color MN:

L _MN＝{[L _P+(L _M-L _P)×(1-XN)+(L _N-L _Q)×XN]+[(L _N-L _M)×XN+L _M]}/2；

Wherein, the degree of the secondary color MN transfer colour changing printing ink N when XN changes color ink M, N allotment aim colour X for using, L _MBe the brightness of conversion color ink M, L _NBe the brightness of conversion color ink N, L _PBe the brightness of Essential colour printing ink P, L _QBe the brightness of Essential colour printing ink N, L _PQFor allocate the brightness of the secondary color PQ of aim colour X, L with Essential colour printing ink P, Q _MNOriginal intensity for described secondary color MN.

7. method according to claim 4 is characterized in that, calculates the initial saturation degree of described secondary color MN among the described step S23, comprising:

As Δ H _MNIn the time of 〉=150 °, adopt following formula to calculate the initial saturation degree of described secondary color MN:

S _MN＝S _PQ+(S _M-S _P)×(1-XN)+(S _N-S _Q)×XN；

As Δ H _MNIn the time of＜55 °, adopt following formula to calculate the initial saturation degree of described secondary color MN:

S _MN＝(S _N-S _M)×XN+S _M；

As 55 °≤Δ H _MNIn the time of＜150 °, adopt following formula to calculate the initial saturation degree of described secondary color MN:

S _MN＝{[S _P+(S _M-S _P)×(1-XN)+(S _N-S _Q)×XN]+[(S _N-S _M)×XN+S _M]}/2；

Wherein, the degree of the secondary color MN transfer colour changing printing ink N when XN changes color ink M, N allotment aim colour X for using, S _MBe the saturation degree of conversion color ink M, S _NBe the saturation degree of conversion color ink N, S _PBe the saturation degree of Essential colour printing ink P, S _QBe the saturation degree of Essential colour printing ink N, S _PQThe saturation degree of secondary color PQ during for usefulness Essential colour printing ink P, Q allotment aim colour X, S _MNInitial saturation degree for described secondary color MN.

8. method according to claim 4 is characterized in that, described step S24 comprises step S241 and step S242;

Step S241: the brightness variable quantity that calculates secondary color MN and aim colour X; According to described brightness variable quantity, described the 4th data, determine when the brightness with secondary color MN is adjusted to the brightness of aim colour X the chalk of required interpolation or the degree of tusche;

Step S242: the saturation degree variable quantity that calculates secondary color MN and aim colour X; Adjust the degree and described the 4th data of the chalk or the tusche of required interpolation according to saturation degree variable quantity, the definite brightness of step S241, when determining that brightness as secondary color MN is adjusted to the brightness of aim colour X and the saturation degree variable quantity of the saturation degree of secondary color MN and aim colour X being adjusted to the saturation degree range of tolerable variance that sets in advance, the chalk of actual required interpolation and/or the degree of tusche, and the interpolation of chalk and tusche order;

The described printing ink color matching prescription of described step S26 output also comprises: the interpolation order of described chalk and tusche.

9. method according to claim 8 is characterized in that, the range of tolerable variance that saturation degree described in the described step S242 is adjusted is [Δ S ₂, Δ S ₁], wherein, Δ S ₁The expression saturation degree is adjusted first tolerance, Δ S ₂The expression saturation degree is adjusted second tolerance;

As Δ S＜Δ S ₂＜0 o'clock, the result that output can't be matched colors, wherein, Δ S is saturation degree variable quantity and the Δ S=S of described secondary color MN and aim colour X _MN-S _X, S _MNBe the initial saturation degree of described secondary color MN, S _XSaturation degree for aim colour X;

As Δ S＞Δ S ₁＞0 o'clock, the degree and described the 4th data of the chalk and/or the tusche of required interpolation are adjusted in definite brightness according to step S241, determine to be adjusted to the brightness of aim colour X and the saturation degree of secondary color MN and the saturation degree variable quantity of aim colour X are adjusted to [Δ S when the brightness of secondary color MN ₂, Δ S ₁] time, the chalk of actual required interpolation and/or the degree of tusche.

10. method according to claim 9 is characterized in that,

Described saturation degree is adjusted the first tolerance Δ S ₁Be 1%～6%, it is-6%～-1% that described saturation degree is adjusted second tolerance;

The range of tolerable variance that form and aspect described in the described step S26 are adjusted is [Δ H ₂, Δ H ₁], wherein, Δ H ₁The expression form and aspect are adjusted first tolerance and Δ H ₁Be 1 °～8 °, Δ H ₂The expression form and aspect are adjusted second tolerance and Δ H ₂Be-8 °～-1 °.

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