CN102082893A - Digital proof color correcting method and digital proof color correcting device - Google Patents
Digital proof color correcting method and digital proof color correcting device Download PDFInfo
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Abstract
The invention discloses a digital proof color correcting method, comprising the following steps: determining a first color data value corresponding to the currently acquired first objective visual colorimetric value according to the mapping relationship of a first objective visual colorimetric value and a first color data value which are stored; acquiring a second objective visual colorimetric value corresponding to a color target figure according to the color target figure generated corresponding to the first color data value; judging whether the error between the second objective visual colorimetric value and the target objective visual colorimetric value exceeds a preset error range, wherein the target objective visual colorimetric value is as follows: source equipment determines out the first objective visual colorimetric value corresponding to the received second color data value according to the stored second color data value and the first objective visual colorimetric value; and continuously correcting or finishing the color correction according to a judgment result. The invention also discloses a digital proof color correcting device. According to the invention, the color matching accuracy can be improved, and the smoothness of drawing can be ensured.
Description
Technical field
The present invention relates to the digital printing field, especially relate to a kind of digital sample printing color calibrating method and a kind of digital sample printing device.
Background technology
Development along with technology such as digital sample printing, digital printings, color management occupies more and more important position in print production, in whole printing process, color management is in middle cardiac status, color management is combined with printing technology, can increase substantially press quality.
In press, digital sample printing is the important means of carrying out quality monitoring in the printing process, and printing the risk and cost is very important for reducing.Digital sample printing in printing process, according to the page picture and text digital information of handling well, utilizes printer directly to export sample manuscript based on digital printing system.Digital sample printing is shortened and is drawn a design the time by the direct input tediously long operations of drawing a design such as substituting glue sheet that tradition draws a design, printing down of drawing a design, and improves the efficient of drawing a design.
In the digital sample printing process, because equipment is concrete otherness on color characteristics, every kind of equipment all has the device color spaces of self apparent color, and source device is different with the equipment color of target device, target device is drawn a design, and the picture color that obtains is also different with the color of source device.For example, printing machine and printer, same color data values may be represented different colors on two kinds of different equipment, this just means that same pictures is different by the visual color effect of the picture that obtains after printing machine and the printer output respectively, at this moment, just need color management that the color characteristics of distinct device is managed.
Color management is adjusted the color of drawing a design by the control to ICC Profile (International Color Consortium Profile, international color joint operation standard) file, realizes and the coupling of printing color, sets up corresponding color management standard.
Now describe with example, in this embodiment, at first, color management is carried out characterization to source device and target device, and the color data values of source device and target device and one group are set up mapping relations one to one with device-independent objective vision chromatic value; According to these mapping relations, at first first color data values is transformed to objective vision chromatic value, translate into second color data values by the objective vision chromatic value of target device after again with conversion, export again.Usually color data values adopts CMYK (Cyan Magenta Yellow Black, blue or green product are yellow black) value representation, and objective vision chromatic value adopts the Lab value representation, and wherein, L represents brightness, the colourity that a, b representative is different.
In above-mentioned characterization process, the precision of color matching directly has influence on the quality of output, and the precision of color matching is to estimate the leading indicator of color management, if the precision of coupling is lower, just can not must reappear the color of printing well, can not play the effect of drawing a design.
In addition, because the mode of this multidimensional table of ICC Profile itself is a kind of process that adopts discrete sampling value reproduction successive value, according to sampling thheorem, have only sample frequency to reach the complete former data of 2 times of ability of former data highest frequency, but, in actual applications, sampled data can not be too much, particularly the middle color lump quantity of the look pommel horse figure of ICC Profile can not be too much, too much can cause measuring the overlong time of color lump itself, it is simple to run counter to color management, principle fast, and color lump quantity can not too much be easier to occur the problem of flatness in drawing.
Summary of the invention
The embodiment of the invention provides a kind of digital sample printing color calibrating method, is used to improve the precision of color matching, guarantees the flatness of drawing, and this method comprises:
According to the first objective vision chromatic value of having stored and the mapping relations of first color data values, determine and the current first corresponding color data values of obtaining of the first objective vision chromatic value;
First color data values according to described correspondence generates look target figure, obtains the second objective vision chromatic value of described look target figure correspondence;
Judge whether the error between the described second objective vision chromatic value and the objective vision chromatic value of target exceeds default error range, the objective vision chromatic value of described target is: by source device according to second color data values of having stored and the mapping relations of the first objective vision chromatic value, the first objective vision chromatic value corresponding that determine with second color data values its reception;
If according to the described second objective vision chromatic value the described current first objective vision chromatic value that obtains is revised, and is obtained the revised first objective vision chromatic value;
If not, finish color correction.
More excellent, described first, second color data values is CMY value or CMYK value or CMYKGO value.
More excellent, according to the described second objective vision chromatic value the described current first objective vision chromatic value that obtains is revised, specifically comprise:
Calculate the difference of the objective vision chromatic value of described target and the described second objective vision chromatic value, and obtain the product of described difference and correction factor, described correction factor is not more than the merchant of described difference and the objective vision chromatic value of described target;
Calculate described current first objective vision chromatic value that obtains and described product and, obtain the revised first objective vision chromatic value.
More excellent, when the described first objective vision chromatic value comprises brightness L, colourity a, colourity b, different correction factors is adopted in the influence of colourity gradual change respectively according to L, a, b, correction factor is inversely proportional to influence to the colourity gradual change.
More excellent, when among L, a, the b any one or multinomial when the colourity bounce-back occurring oppositely compensates correction for the bounce-back item.
More excellent, when adopting the white digital sample printing mode of simulation paper, the objective vision chromatic value of described target adopts absolute objective vision chromatic value.
More excellent, adopt when not simulating the white digital sample printing mode of paper, the objective vision chromatic value of described target adopts relatively objective vision chromatic value.
More excellent, when the described current first objective vision chromatic value that obtains being revised according to the described second objective vision chromatic value, in look target figure according to the error distribution color lump number between the described second objective vision chromatic value and the objective vision chromatic value of target, described error is big more, and the color lump number that distributes for the described second objective vision chromatic value is many more.
The embodiment of the invention also provides a kind of digital sample printing color correction device, is used to improve the precision of color matching, guarantees the flatness of drawing, comprises determining unit, acquiring unit, judging unit, amending unit and end unit:
Described determining unit is used for determining and the current first corresponding color data values of obtaining of the first objective vision chromatic value according to the first objective vision chromatic value of having stored and the mapping relations of first color data values;
Described acquiring unit is used for generating look target figure according to first color data values of described correspondence, obtains the second objective vision chromatic value of described look target figure correspondence;
Described judging unit, be used to judge whether the error between the described second objective vision chromatic value and the objective vision chromatic value of target exceeds default error range, the objective vision chromatic value of described target is: by source device according to second color data values of having stored and the mapping relations of the first objective vision chromatic value, the first objective vision chromatic value corresponding that determine with second color data values its reception; If, trigger described amending unit, if not, trigger described end unit;
Described amending unit is used for according to the described second objective vision chromatic value the described current first objective vision chromatic value that obtains being revised;
Described end unit is used to finish color correction.
More excellent, described amending unit is further used for: the difference of calculating the objective vision chromatic value of described target and the described second objective vision chromatic value, and obtaining the product of described difference and correction factor, described correction factor is not more than the merchant of described difference and the objective vision chromatic value of described target; Calculate described current first objective vision chromatic value that obtains and described product and, obtain the revised first objective vision chromatic value.
More excellent, described amending unit is further used for: described when the described first objective vision chromatic value comprises brightness L, colourity a, colourity b, according to L, a, b different correction factors is adopted in the influence of colourity gradual change respectively, correction factor with the influence of colourity gradual change is inversely proportional to.
More excellent, described amending unit is further used for: when among L, a, the b any one or multinomial when the colourity bounce-back occurring oppositely compensates correction for the bounce-back item.
In the embodiment of the invention, first color data values according to the current first objective vision chromatic value correspondence of obtaining generates look target figure, obtain the second objective vision chromatic value of look target figure correspondence, judge whether the error between the second objective vision chromatic value and the objective vision chromatic value of target exceeds default error range, when exceeding default error range, be that the precision of color matching is not when satisfying cartographic accuracy and requiring, according to the second objective vision chromatic value the current first objective vision chromatic value that obtains is revised, and obtain the revised first objective vision chromatic value, and then according to the revised first objective vision chromatic value generation look target figure, whether the precision of judging the color matching of this look target figure satisfies the cartographic accuracy requirement, if do not satisfy, continue to revise, the circulation color correction, error until between the second objective vision chromatic value and the objective vision chromatic value of target does not exceed default error range, and promptly the precision of color matching can satisfy the cartographic accuracy requirement, finishes color correction.In embodiments of the present invention, the precision of the picture color matching that generates after color correction can satisfy the cartographic accuracy requirement, can reappear the color of printing well, plays the effect of drawing a design.
Further, when the current first objective vision chromatic value that obtains being revised according to the second objective vision chromatic value, in look target figure according to the error distribution color lump number between the second objective vision chromatic value and the objective vision chromatic value of target, error is big more, is that the color lump number of the second objective vision chromatic value distribution is many more.Shortly, near the more color lump of the distribution of the second objective vision chromatic value that error is big, thereby when revising, may obtain more correction value, guarantee under the constant situation of color lump quantity, the maximized error that reduces, improve the precision of color matching, simultaneously, can also under the constant situation of color lump quantity, guarantee the flatness of drawing.
Description of drawings
Fig. 1 is the particular flow sheet of a kind of digital sample printing color calibrating method in the embodiment of the invention;
Fig. 2 is the particular flow sheet of the example of digital sample printing color calibrating method in the embodiment of the invention;
Fig. 3 is the structural representation of digital sample printing color correction device in the embodiment of the invention.
Embodiment
For improving the precision of color matching, reappear the color of printing preferably, the embodiment of the invention provides a kind of digital sample printing color calibrating method, and concrete handling process comprises as shown in Figure 1:
The first objective vision chromatic value that step 101, basis have been stored and the mapping relations of first color data values are determined and the current first corresponding color data values of obtaining of the first objective vision chromatic value;
Flow process as shown in Figure 1, during enforcement, first, second color data values can adopt multiple color mode, for example, can adopt CMYK, also can adopt CMY (Cyan Magenta Yellow, blue or green product are yellow), can also adopt CMYKGO (Cyan Magenta Yellow Black Green Orange, the yellow black green orange of blue or green product), certainly, can also adopt other color modes, can simulate corresponding color according to the color mode that adopts and get final product.
Flow process as shown in Figure 1, step 103 is when implementing, the objective vision chromatic value of target is: by source device according to second color data values of having stored and the mapping relations of the first objective vision chromatic value, the first objective vision chromatic value corresponding that determine with second color data values its reception.
During enforcement, store the mapping relations of the first objective vision chromatic value and first color data values in the target device (as printer), store the mapping relations of second color data values and the first objective vision chromatic value in the source device (as printing machine).When source device receives one second color data values, mapping relations according to second color data values and the first objective vision chromatic value, find the first objective vision chromatic value corresponding with second color data values that receives, and with this first objective vision chromatic value as the objective vision chromatic value of target, and obtain.In this example, when source device did not receive second color data values of other inputs, the objective vision chromatic value of target was changeless.
During the objective vision chromatic value of the target that sends when target device reception sources equipment, according to the first objective vision chromatic value of storing in the target device and the mapping relations of first color data values, determine and the first corresponding color data values of the objective vision chromatic value of target, and then generate look target figure according to this first color data values.
For guaranteeing the precision of color matching, the look target figure that generates is measured, obtain the second objective vision chromatic value of this look target figure correspondence, calculate the error between the second objective vision chromatic value and the objective vision chromatic value of target, if error does not exceed default error range, expression color matching precision is very high, the color that can reappear source device preferably, color correction finishes, and checks the picture that target device prints, if dissatisfied, can adjust again pictorial information.If error has exceeded default error range, expression color matching precision is lower, can not reappear the color of source device preferably, lost the effect of drawing a design, therefore, need adjust target device, to obtain higher color matching precision, embodiment sees also flow process among Fig. 1.
Wherein, step 104 is when implementing, after target device obtains the revised first objective vision chromatic value, return step 101, and carry out subsequent step 102 successively to step 104, judge whether the error between the revised first objective vision chromatic value and the objective vision chromatic value of target exceeds default error range, circulation execution in step 101 is to step 104, error until between the revised first objective vision chromatic value and the objective vision chromatic value of target does not exceed default error range, when satisfying the required color matching precision of the color of reproduction source device, execution in step 105 finishes color correction.
Flow process as shown in Figure 1, step 104 is when implementing, and concrete correcting mode is as follows: calculate the difference of the objective vision chromatic value of target and the second objective vision chromatic value, and obtain the product of difference and correction factor, wherein, correction factor is not more than the merchant of difference and the objective vision chromatic value of target; Calculate current first objective vision chromatic value that obtains and product and, obtain the revised first objective vision chromatic value.
In order more clearly to give expression to the correcting mode of the first objective vision chromatic value, its form with formula can be experienced, specific as follows:
The revised first objective vision chromatic value=current first objective vision chromatic value+correction factor that obtains * (the objective vision chromatic value of the objective vision chromatic value-second of target), wherein,
Correction factor≤(the objective vision chromatic value of the objective vision chromatic value-second of target)/objective vision chromatic value of target.
The correction principle of above-mentioned formula is: if the objective vision chromatic value of second objective vision chromatic value＜target, at this moment, need to increase the current first objective vision chromatic value that obtains, at this moment, the difference of the objective vision chromatic value of target and the second objective vision chromatic value can play the effect of increase greater than 0; In like manner, if the objective vision chromatic value of second objective vision chromatic value＞target, at this moment, need reduce the current first objective vision chromatic value that obtains, at this moment, the difference of the objective vision chromatic value of target and the second objective vision chromatic value can play the effect that reduces less than 0.
In makeover process, for the accuracy of guarantee revising, should select correction factor accurately, when implementing usually, correction factor should be positioned between (0,0.1), avoids causing because of correction value is excessive bigger gradual change.
Because the correction to the first objective vision chromatic value is to implement on the basis of the current first objective vision chromatic value that obtains, therefore, the each correction all carried out correcting process again on the preceding basis of once revising, can realize the accumulation of error correction, improves the precision of color matching.
During enforcement, existing digital sample printing generally is divided into the simulation white digital sample printing of paper or does not simulate the white digital sample printing of paper, simulation paper is meant the color of another paper of simulation on a kind of paper in vain, when adopting the white digital sample printing mode of simulation paper, the objective vision chromatic value of the target of mentioning in the flow process shown in Figure 1 adopts absolute objective vision chromatic value; When adopting when not simulating the white digital sample printing mode of paper, the objective vision chromatic value of the target of mentioning in the flow process shown in Figure 1 adopts relatively objective vision chromatic value, can guarantee not change form and aspect, improves the precision of color matching.
Usually select Lab as the objective vision chromatic value of using, because L, a, b are for the difference that influences of colourity gradual change, therefore, for guaranteeing the precision of color matching, can adopt different correction factors respectively to the influence of colourity gradual change according to L, a, b, wherein, correction factor with the influence of colourity gradual change is inversely proportional to.
During enforcement, because L, a, b can separately revise, therefore, when among L, a, the b any one or multinomial when the colourity bounce-back occurring can oppositely compensate correction for the bounce-back item.
Certainly, when implementing, only revise for the point in the appointment colour gamut, will not revise the point that this bulletin colour is overseas, revised value exceeds colour gamut during as if correction, needs to reduce correction value, is positioned at the appointment colour gamut to satisfy this point.
Flow process as shown in Figure 1, step 104 is when implementing, when the current first objective vision chromatic value that obtains being revised according to the second objective vision chromatic value, in look target figure according to the error distribution color lump number between the second objective vision chromatic value and the objective vision chromatic value of target, error is big more, is that the color lump number of the second objective vision chromatic value distribution is many more.Shortly, near the more color lump of the distribution of the second objective vision chromatic value that error is big, thereby when revising, may obtain more correction value, guarantee under the constant situation of color lump quantity, the maximized error that reduces, improve the precision of color matching, simultaneously, can also under the constant situation of color lump quantity, guarantee the flatness of drawing.
Be that example describes now with printing machine and printer, in this example, describe for convenient, color data values adopts CMYK, objective vision chromatic value adopts Lab, stores the CMYK-Lab mapping relations in the printing machine, stores Lab-CMYK mapping relations table in the printer, error between the first objective vision chromatic value and the objective vision chromatic value of target is designated as DeltaE, concrete steps as shown in Figure 2:
The 2nd CMYK that step 203, basis find generates look target figure and prints;
The look target figure that step 204, measurement generate obtains measurement Lab corresponding among this look target figure, and calculates DeltaE according to measuring Lab and target Lab;
The look target figure that step 209, measurement generate obtains measurement Lab corresponding among this look target figure, and calculates DeltaE according to measuring Lab and target Lab;
Flow process as shown in Figure 2, the default error range of mentioning in step 205 and the step 210 is set to (0,1.5) usually, to guarantee that color matching has higher precision, suppose that calculating DeltaE in the step 204 is 4.07, then exceeds (0,1.5), continue execution in step 206; Supposing to calculate in step 204 or the step 209 DeltaE is 1.12, does not then exceed (0,1.5), finishes color correction.
Based on same inventive concept, the embodiment of the invention also provides a kind of digital sample printing color correction device, specifically as shown in Figure 3, comprises determining unit 301, acquiring unit 302, judging unit 303, amending unit 304 and end unit 305:
Determining unit 301 is used for determining and the current first corresponding color data values of obtaining of the first objective vision chromatic value according to the first objective vision chromatic value of having stored and the mapping relations of first color data values;
Acquiring unit 302 is used for generating look target figure according to first color data values of correspondence, obtains the second objective vision chromatic value of look target figure correspondence;
Judging unit 303, be used to judge whether the error between the second objective vision chromatic value and the objective vision chromatic value of target exceeds default error range, the objective vision chromatic value of target is: by source device according to second color data values of having stored and the mapping relations of the first objective vision chromatic value, the first objective vision chromatic value corresponding that determine with second color data values its reception; If, trigger amending unit 304, if not, trigger end unit 305;
Amending unit 304 is used for according to the second objective vision chromatic value the current first objective vision chromatic value that obtains being revised;
In one embodiment, amending unit 304 can be further used for: the difference of calculating the objective vision chromatic value of target and the second objective vision chromatic value, and obtaining the product of difference and correction factor, correction factor is not more than the merchant of difference and the objective vision chromatic value of target; Calculate current first objective vision chromatic value that obtains and product and, obtain the revised first objective vision chromatic value.
In one embodiment, amending unit can also be further used for: when the first objective vision chromatic value comprises brightness L, colourity a, colourity b, according to L, a, b different correction factors is adopted in the influence of colourity gradual change respectively, correction factor with the influence of colourity gradual change is inversely proportional to.
In one embodiment, amending unit 304 can also be further used for: oppositely compensate correction for the bounce-back item colourity when bounce-back when any one or multinomial appearance the among L, a, the b.
In the embodiment of the invention, first color data values according to the current first objective vision chromatic value correspondence of obtaining generates look target figure, obtain the second objective vision chromatic value of look target figure correspondence, judge whether the error between the second objective vision chromatic value and the objective vision chromatic value of target exceeds default error range, when exceeding default error range, be that the precision of color matching is not when satisfying cartographic accuracy and requiring, according to the second objective vision chromatic value the current first objective vision chromatic value that obtains is revised, and obtain the revised first objective vision chromatic value, and then according to the revised first objective vision chromatic value generation look target figure, whether the precision of judging the color matching of this look target figure satisfies the cartographic accuracy requirement, if do not satisfy, continue to revise, the circulation color correction, error until between the second objective vision chromatic value and the objective vision chromatic value of target does not exceed default error range, and promptly the precision of color matching can satisfy the cartographic accuracy requirement, finishes color correction.In embodiments of the present invention, the precision of the picture color matching that generates after color correction can satisfy the cartographic accuracy requirement, can reappear the color of printing well, plays the effect of drawing a design.
Further, when the current first objective vision chromatic value that obtains being revised according to the second objective vision chromatic value, in look target figure according to the error distribution color lump number between the second objective vision chromatic value and the objective vision chromatic value of target, error is big more, is that the color lump number of the second objective vision chromatic value distribution is many more.Shortly, near the more color lump of the distribution of the second objective vision chromatic value that error is big, thereby when revising, may obtain more correction value, guarantee under the constant situation of color lump quantity, the maximized error that reduces, improve the precision of color matching, simultaneously, can also under the constant situation of color lump quantity, guarantee the flatness of drawing.
Obviously, those skilled in the art can carry out various changes and distortion to the present invention and not break away from the spirit and scope of the present invention.Like this, if these modifications of the present invention and distortion belong within claim of the present invention and the equivalent technologies scope thereof, then the present invention also is intended to comprise these changes and is out of shape interior.
Claims (12)
1. a digital sample printing color calibrating method is characterized in that, comprising:
According to the first objective vision chromatic value of having stored and the mapping relations of first color data values, determine and the current first corresponding color data values of obtaining of the first objective vision chromatic value;
First color data values according to described correspondence generates look target figure, obtains the second objective vision chromatic value of described look target figure correspondence;
Judge whether the error between the described second objective vision chromatic value and the objective vision chromatic value of target exceeds default error range, the objective vision chromatic value of described target is: by source device according to second color data values of having stored and the mapping relations of the first objective vision chromatic value, the first objective vision chromatic value corresponding that determine with second color data values its reception;
If according to the described second objective vision chromatic value the described current first objective vision chromatic value that obtains is revised, and is obtained the revised first objective vision chromatic value;
If not, finish color correction.
2. the method for claim 1 is characterized in that, described first, second color data values is yellow black CMYK value of blue or green yellow CMY value of product or blue or green product or the yellow black green orange CMYKGO value of blue or green product.
3. the method for claim 1 is characterized in that, according to the described second objective vision chromatic value the described current first objective vision chromatic value that obtains is revised, and specifically comprises:
Calculate the difference of the objective vision chromatic value of described target and the described second objective vision chromatic value, and obtain the product of described difference and correction factor, described correction factor is not more than the merchant of described difference and the objective vision chromatic value of described target;
Calculate described current first objective vision chromatic value that obtains and described product and, obtain the revised first objective vision chromatic value.
4. method as claimed in claim 3, it is characterized in that, when the described first objective vision chromatic value comprises brightness L, colourity a, colourity b, according to L, a, b different correction factors is adopted in the influence of colourity gradual change respectively, correction factor with the influence of colourity gradual change is inversely proportional to.
5. method as claimed in claim 4 is characterized in that, oppositely compensates correction for the bounce-back item colourity when bounce-back when any one or multinomial appearance the among L, a, the b.
6. as each described method of claim 1 to 5, it is characterized in that when adopting the white digital sample printing mode of simulation paper, the objective vision chromatic value of described target adopts absolute objective vision chromatic value.
7. as each described method of claim 1 to 5, it is characterized in that adopt when not simulating the white digital sample printing mode of paper, the objective vision chromatic value of described target adopts relatively objective vision chromatic value.
8. the method for claim 1, it is characterized in that, when the described current first objective vision chromatic value that obtains being revised according to the described second objective vision chromatic value, in look target figure according to the error distribution color lump number between the described second objective vision chromatic value and the objective vision chromatic value of target, described error is big more, and the color lump number that distributes for the described second objective vision chromatic value is many more.
9. a digital sample printing color correction device is characterized in that, comprises determining unit, acquiring unit, judging unit, amending unit and end unit:
Described determining unit is used for determining and the current first corresponding color data values of obtaining of the first objective vision chromatic value according to the first objective vision chromatic value of having stored and the mapping relations of first color data values;
Described acquiring unit is used for generating look target figure according to first color data values of described correspondence, obtains the second objective vision chromatic value of described look target figure correspondence;
Described judging unit, be used to judge whether the error between the described second objective vision chromatic value and the objective vision chromatic value of target exceeds default error range, the objective vision chromatic value of described target is: by source device according to second color data values of having stored and the mapping relations of the first objective vision chromatic value, the first objective vision chromatic value corresponding that determine with second color data values its reception; If, trigger described amending unit, if not, trigger described end unit;
Described amending unit is used for according to the described second objective vision chromatic value the described current first objective vision chromatic value that obtains being revised;
Described end unit is used to finish color correction.
10. device as claimed in claim 9, it is characterized in that, described amending unit is further used for: the difference of calculating the objective vision chromatic value of described target and the described second objective vision chromatic value, and obtaining the product of described difference and correction factor, described correction factor is not more than the merchant of described difference and the objective vision chromatic value of described target; Calculate described current first objective vision chromatic value that obtains and described product and, obtain the revised first objective vision chromatic value.
11. device as claimed in claim 10, it is characterized in that, described amending unit is further used for: described when the described first objective vision chromatic value comprises brightness L, colourity a, colourity b, according to L, a, b different correction factors is adopted in the influence of colourity gradual change respectively, correction factor with the influence of colourity gradual change is inversely proportional to.
12. device as claimed in claim 11 is characterized in that, described amending unit is further used for: oppositely compensate correction for the bounce-back item colourity when bounce-back when any one or multinomial appearance the among L, a, the b.
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| JP2007221182A (en) * | 2006-02-14 | 2007-08-30 | Fuji Xerox Co Ltd | Apparatus, program and method of processing image |
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