CN102082894A - Equipment calibration method and output device - Google Patents
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Abstract
The invention discloses an equipment calibration method and an output device, relating to a color management technology. The equipment calibration method comprises the steps: converting every first color data group in a file to a second color data group according to a first corresponding relation table of the stored first color data groups and second color data groups, wherein the second color data groups are the color data groups corresponding to target objective vision chromatic values which is necessary to output by the first color data groups, in a second corresponding relation table of actual objective vision chromatic values and color data groups, and the second corresponding relation table derives from a color target diagram output through measurement equipment; and outputting the file according to the second color data groups. The color data groups are directly used for calibration, so the correlation of various parameters is taken into consideration, and the equipment calibration efficiency, the operation easiness and the calibration effect are enhanced.
Description
Technical field
The present invention relates to Color Management Technology, relate in particular to a kind of Equipment Alignment technology in the Color Management Technology.
Background technology
Along with the development of technology such as colour shows, number is printed and digital printed, the effect of color management in demonstration and print production is more and more important.Color is the core of display and print quality control, and in printing enterprise's whole production management, color management is in middle cardiac status.The printing color management is set about introducing and implemented in increasing printing enterprise, and expectation forms the higher print production system of efficient by printing color management and cooperating of modern printing new technology, improves press quality and Enterprises'Competitiveness.
Color management generally is divided into three steps: Equipment Alignment, device characteristicsization, color conversion.Equipment Alignment is meant to be proofreaied and correct each equipment in the print production flow process, and the normalization process parameter makes it be operated in stable status; Device characteristicsization are meant under the prerequisite that equipment is calibrated, and measure color datas and generate the chromatic characteristic file of equipment, the colour gamut feature of recording equipment by various software and hardware instruments.Color conversion is to utilize color management module to pass through device independent color space (Lab, XYZ etc.) to carry out the conversion of device dependent color spaces (CMYK, RGB etc.), realizes the consistency of exporting to the whole process color of printing from before printing.
Equipment Alignment and device characteristicsization are effectively to implement the key of color management.Equipment Alignment is just to the simple correction of each equipment, but to the once comprehensive calibration of print production technology and process, is the standardization and the standardization of print production technological parameter.
Traditional Equipment Alignment is based on all that 4 curves that correspond respectively to CMYK carry out, owing to adjust based on 4 independent curves, so make for CMYK in output and also to handle respectively, and the correlation that can't consider CMYK is adjusted and handled to 4 curves respectively, for example, for CMYK=[30,50,50,50] and CMYK=[30,60,60,60] in, when C curve was adjusted, the adjustment at the C=30 place was identical, though and in fact same C=30, but because the difference of MYK value, the adjustment of C might be different, the drawback that Here it is adjusts based on 4 irrelevant curves, and based on the calibration of 4 curves because both needed to consider level problem, need again to consider the grey balance problem, so the effect that needs operating personnel's certain experience just can obtain.
And development along with printing and printing technique, the particularly development of digital printing, used printing ink has been not limited to CMYK four looks, in order to pursue more high-quality printing and printing effect, the application that has added shallow China ink, the application of other look China inks such as more particularly orange, green, this just has higher requirement to Equipment Alignment, and can not adapt to Equipment Alignment requirement under the complex situations like this based on the Equipment Alignment mode of curve originally.
Summary of the invention
The embodiment of the invention provides a kind of equipment calibration method and output device, to improve efficient, ease for operation and the calibration effect of Equipment Alignment.
A kind of equipment calibration method comprises:
Each first color data group in the file is converted to the second color data group according to first color data group of storage and first mapping table of the second color data group; The described second color data group is the objective vision chromatic value of target that should export of the described first color data group corresponding color data group in second mapping table of objective vision chromatic value of reality and color data group, and described second mapping table is that the look target figure by measuring equipment output obtains;
Export described file according to the described second color data group.
Further, the preparation method of described first mapping table is specially:
Measure the look target figure that output equipment to be calibrated is exported, obtain the actual objective vision chromatic value of each color data group correspondence;
Actual objective vision chromatic value according to each color data group correspondence generates described second mapping table;
To each first color data group, determine the objective vision chromatic value of its target that should export;
Determine the second color data group of the objective vision chromatic value of target correspondence in described second mapping table of each first color data group, and described first color data group and the described second color data group correspondence are added in described first mapping table.
Preferable, the objective vision chromatic value of target that the described first color data group should be exported is specially: the desirable objective vision chromatic value of the described first color data group correspondence, the objective vision chromatic value of the desirable objective vision chromatic value of the most approaching described first color data group correspondence that perhaps described equipment can be exported.
Further, described color data group is specially CMY value or CMYK value or CMYKGO value, and described objective vision chromatic value is specially the Lab value.
Further, when described color data group was specially the CMY value, the method that obtains the target Lab value of a described CMY value specifically comprised:
When a described CMY value is white point and stain, determine that its target Lab value is identical with the desirable Lab value of a described CMY value;
When M value and Y value are zero in the described CMY value, obtain in the actual Lab space, satisfying M value and Y value is that zero maximum point and the C value of a value is 1, M value and Y value are 1 corresponding point, and be 1 in described a value maximum point and C value, M value and Y value are that the Lab value of determining this group CMY value correspondence is the target Lab value of a described CMY value when finding one group of CMY value to make the desirable a value of its corresponding the most approaching described CMY value of a value in the straight line that constituted of zero corresponding point;
When C value and Y value are zero in the described CMY value, obtain in the actual Lab space, satisfying C value and Y value is that zero maximum point and the M value of a value is 1, C value and Y value are 1 corresponding point, and be 1 in described a value maximum point and M value, C value and Y value are that the Lab value of determining this group CMY value correspondence is the target Lab value of a described CMY value when finding one group of CMY value to make the desirable a value of its corresponding the most approaching described CMY value of a value in the straight line that constituted of zero corresponding point;
When C value and M value are zero in the described CMY value, obtain in the actual Lab space, satisfying C value and M value is that zero maximum point and the Y value of b value is 1, C value and M value are 1 corresponding point, and be 1 in described b value maximum point and Y value, C value and M value are that the Lab value of determining this group CMY value correspondence is the target Lab value of a described CMY value when finding one group of CMY value to make the desirable b value of its corresponding the most approaching described CMY value of b value in the straight line that constituted of zero corresponding point;
The C value is zero in the described CMY value, when M value and Y value equate, in described second mapping table, keeping the C value is zero, adjusting M value and Y value searches, up to finding one group of CMY value to make the desirable Lch space hue angle of the most approaching described CMY value of its Lch space hue angle, determine the target Lab value of the corresponding Lab value of this group CMY value for a described CMY value;
The M value is zero in the described CMY value, when C value and Y value equate, in described second mapping table, keeping the M value is zero, adjusting C value and Y value searches, up to finding one group of CMY value to make the desirable Lch space hue angle of the most approaching described CMY value of its Lch space hue angle, determine the target Lab value of the corresponding Lab value of this group CMY value for a described CMY value;
The Y value is zero in the described CMY value, when C value and M value equate, in described second mapping table, keeping the Y value is zero, adjusting C value and M value searches, up to finding one group of CMY value to make the desirable Lch space hue angle of the most approaching described CMY value of its Lch space hue angle, determine the target Lab value of the corresponding Lab value of this group CMY value for a described CMY value;
When C value, M value or Y value one are zero in the described CMY value, be zero according to the C value respectively, M value and Y value equate, the M value is zero, C value and Y value equate and the Y value is zero, Lch space hue angle adjusted value when C value and M value equate is adjusted the Lch space hue angle in the corresponding Lch value of a described CMY value, determines that the Lab value behind the hue angle of adjustment Lch space is the target Lab value of a described CMY value;
When C value, M value and Y value are all non-vanishing in the described CMY value, C value M value in this CMY value and Y value are all deducted value minimum in C value M value and the Y value, again according to C value, M value or Y value one be zero or its two be that zero method obtains Lch space hue angle adjustment amount, adjust Lch space hue angle in the corresponding Lch value of a described CMY value according to the Lch space hue angle adjustment amount that is obtained, determine that the Lab value behind the hue angle of adjustment Lch space is the target Lab value of a described CMY value;
When C value, M value and Y value satisfy grey axis data condition in the described CMY value, find one group of CMY value in the ash axle in actual Lab space, make the desirable Lab value of its corresponding the most approaching described CMY value of Lab value, determine that the corresponding Lab value of this group CMY value is the corresponding target Lab value of a described CMY value.
Preferable, described color data group is specially CMYK value or CMYKGO value.
Corresponding a kind of output device comprises:
Be used for each first color data group of file is converted to according to first mapping table of the first color data group of storing and the second color data group unit of the second color data group; The described second color data group is the objective vision chromatic value of target that should export of the described first color data group corresponding color data group in second mapping table of objective vision chromatic value of reality and color data group, and described second mapping table is that the look target figure by measuring equipment output obtains;
Be used for exporting the unit of described file according to the described second color data group.
Further, described output device also comprises:
Be used to measure the look target figure that output equipment to be calibrated is exported, obtain the unit of the actual objective vision chromatic value of each color data group correspondence;
Be used for actual objective vision chromatic value, generate the unit of described second mapping table according to each color data group correspondence;
Be used for each first color data group is determined the unit of the objective vision chromatic value of its target that should export;
The objective vision chromatic value of target that is used for determining each first color data group is in the second corresponding color data group of described second mapping table, and adds the described first color data group and the described second color data group correspondence in described first mapping table unit.
The embodiment of the invention provides a kind of equipment calibration method and output device, set up the mapping table of a color data group and actual objective vision chromatic value by the look target figure of output before calibrating, again by searching the actual objective vision chromatic value that the objective vision chromatic value of the target that should export with each color data group equates, the pairing color data group of actual objective vision chromatic value that should equate with the objective vision chromatic value of target that the primitive color data set should be exported in the acquisition mapping table is as the output color data group of primitive color data set, and with each original data set and the upright corresponding relation of output color data establishment, showing, when printing waits output, earlier according to the corresponding relation between the color data group of primitive color data set and output, the color data class value of original document is converted to the color data group of output, show again, outputs such as printing, thereby obtain comparatively ideal output effect, reached the purpose of Equipment Alignment, because directly using the color data group calibrates, consider the correlation between each parameter, improved Equipment Alignment efficient, ease for operation and calibration effect.
Description of drawings
Fig. 1 is for carrying out the method flow diagram of Equipment Alignment in the embodiment of the invention;
Fig. 2 is the method flow diagram that obtains first mapping table in the embodiment of the invention;
Fig. 3 is a value of desirable ash axle in the embodiment of the invention and the curve chart of b value;
Fig. 4 a is the curve chart that carries out preceding a value of Equipment Alignment and b value in the embodiment of the invention;
Fig. 4 b is the curve chart that carries out a value and b value behind the Equipment Alignment in the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of equipment calibration method and output device, before calibration equipment, output look target figure, by measuring the objective vision chromatic value of look target figure, obtain the mapping table of the second color data group and actual objective vision chromatic value, again at each first color data group, search the actual objective vision chromatic value that the objective vision chromatic value of the target that should export with this color data group equates, obtain in the mapping table the pairing second color data group of Lab measured value that equates with target Lab value that the first color data group should be exported, this first color data group and this second color data group are mapped, form the color data group mapping table of the first color data group and the second color data group, like this, when carrying out file output, with the color data group in the file as the first color data group, be converted to after the second color data group according to the second color data group output file by color data group mapping table, the objective vision chromatic value of target that the objective vision chromatic value of resulting like this output just just should be exported for the first color data group in the file, thus reached the purpose of Equipment Alignment.
As shown in Figure 1, the equipment calibration method that provides of the embodiment of the invention comprises the steps:
Step S101, each the first color data group in the file is converted to the second color data group according to first mapping table of the first color data group of being stored and the second color data group;
Step S102, according to the second color data group output file.
Wherein, the color data group can be CMY, CMYK or CMYGO, the second color data group is the objective vision chromatic value of target that should export of the first color data group corresponding color data group in second mapping table of objective vision chromatic value of reality and color data group, and second mapping table is that the look target figure by measuring equipment output obtains.
As shown in Figure 2, the generation method of first mapping table comprises the steps:
Step S201, use output equipment output look target figure to be calibrated;
Step S202, measure the actual objective vision chromatic value that look target figure obtains each color data group correspondence by measuring equipment;
Second mapping table of step S203, the actual objective vision chromatic value of generation and the second color data group;
In this second mapping table, comprised in the complete objective vision chromatic value space corresponding relation of the actual objective vision chromatic value of all in accuracy rating and the second color data group.
Step S204, to each first color data group, determine the objective vision chromatic value of its target that should export;
Step S205, the objective vision chromatic value of target corresponding second color data group in second mapping table of determining each first color data group, and the second color data group correspondence of each first color data group and its correspondence added in first mapping table.
In step S204, according to different equipment, the objective vision chromatic value of the target of each color data group is different, for more satisfactory equipment, can export the desirable objective vision chromatic value that each color data group should be exported, in this equipment, the objective vision chromatic value of the target of each color data group is exactly the desirable objective vision chromatic value that each color data group should be exported so; But for most of equipment, possibly can't export the desirable objective vision chromatic value that some color data group should be exported, so this moment, the objective vision chromatic value of the target of these color data groups can be chosen one group of objective vision chromatic value of the objective vision chromatic value of the most approaching ideal in the objective vision chromatic value that this equipment can export, when choosing, can be in the mapping table of the objective vision chromatic value of reality and the second color data group, by on the basis of the first color data group, constantly adjusting color data values, obtain actual objective vision chromatic value, and make it as far as possible near the desirable objective vision chromatic value of the first color data group, the objective vision chromatic value of target that in the mapping table of the objective vision chromatic value of reality and the second color data group, is the first color data group near one group of objective vision chromatic value of the objective vision chromatic value of this ideal.
With the color data group is CMY, and objective vision chromatic value is an example during for Lab, when obtaining the corresponding target Lab value of a CMY value, and can be by following several situation discussion:
When the one CMY value is white point and stain, determine that its target Lab value is identical with the desirable Lab value of a CMY value;
When M value and Y value are zero in the one CMY value, obtain in the actual Lab space, satisfying M value and Y value is that zero maximum point and the C value of a value is 1, M value and Y value are 1 corresponding point, and be 1 in a value maximum point and C value, M value and Y value are when finding one group of CMY value to make its corresponding a value near the desirable a value of a CMY value in the zero corresponding straight line that point constituted, to determine that the Lab value of this group CMY value correspondence is the target Lab value of a CMY value;
When C value and Y value are zero in the one CMY value, obtain in the actual Lab space, satisfying C value and Y value is that zero maximum point and the M value of a value is 1, C value and Y value are 1 corresponding point, and be 1 in a value maximum point and M value, C value and Y value are when finding one group of CMY value to make its corresponding a value near the desirable a value of a CMY value in the zero corresponding straight line that point constituted, to determine that the Lab value of this group CMY value correspondence is the target Lab value of a CMY value;
When C value and M value are zero in the one CMY value, obtain in the actual Lab space, satisfying C value and M value is that zero maximum point and the Y value of b value is 1, C value and M value are 1 corresponding point, and be 1 in b value maximum point and Y value, C value and M value are when finding one group of CMY value to make its corresponding b value near the desirable b value of a CMY value in the zero corresponding straight line that point constituted, to determine that the Lab value of this group CMY value correspondence is the target Lab value of a CMY value;
The C value is zero in the one CMY value, when M value and Y value equate, in second mapping table, keeping the C value is zero, adjusting M value and Y value searches, up to finding one group of CMY value to make its Lch space hue angle, determine that the corresponding Lab value of this group CMY value is the target Lab value of a CMY value near the desirable Lch space hue angle of a CMY value;
The M value is zero in the one CMY value, when C value and Y value equate, in second mapping table, keeping the M value is zero, adjusting C value and Y value searches, up to finding one group of CMY value to make its Lch space hue angle, determine that the corresponding Lab value of this group CMY value is the target Lab value of a CMY value near the desirable Lch space hue angle of a CMY value;
The Y value is zero in the one CMY value, when C value and M value equate, in second mapping table, keeping the Y value is zero, adjusting C value and M value searches, up to finding one group of CMY value to make its Lch space hue angle, determine that the corresponding Lab value of this group CMY value is the target Lab value of a CMY value near the desirable Lch space hue angle of a CMY value;
When C value, M value or Y value one are zero in the one CMY value, be zero according to the C value respectively, M value and Y value equate, the M value is zero, C value and Y value equate and the Y value is zero, Lch space hue angle adjusted value when C value and M value equate is adjusted the Lch space hue angle in the corresponding Lch value of a CMY value, determines that the Lab value behind the hue angle of adjustment Lch space is the target Lab value of a CMY value;
When C value, M value and Y value are all non-vanishing in the one CMY value, C value M value in this CMY value and Y value are all deducted value minimum in C value M value and the Y value, again according to C value, M value or Y value one be zero or its two be that zero method obtains Lch space hue angle adjustment amount, adjust Lch space hue angle in the corresponding Lch value of a CMY value according to the Lch space hue angle adjustment amount that is obtained, determine that the Lab value behind the hue angle of adjustment Lch space is the target Lab value of a CMY value;
When C value, M value and Y value satisfy grey axis data condition in the one CMY value, find one group of CMY value in the ash axle in actual Lab space, make its corresponding Lab value near the desirable Lab value of a CMY value, determine that the corresponding Lab value of this group CMY value is the target Lab value of CMY value correspondence.
Making it reach G7 ash axle standard with grey axis calibration is example, if print the machine calibration, the pass of cyan Cyan is among a value in the so desirable Lab value, b value and the CMY:
A=a
Paper* (100-Cyan)/100, b=b
Paper* (100-Cyan)/100, and wherein, a
PaperAnd b
PaperA value and b value for the Hard copy body that is used to print.
The desirable a value and the b value regularity of distribution as shown in Figure 3, the absolute value of a value and b value is reduced to shadow gradually by high light.
Before carrying out Equipment Alignment, obtain the mapping table that the ash axle is gone up the actual Lab value and the second color data group by the look target figure that prints, partial data is as follows:
The ash axle is gone up the mapping table of actual Lab value and color data group before table 1 Equipment Alignment
| C％ | M％ | Y％ | L* | a* | b* |
| 0 | 0 | 0 | 94.15 | 1.79 | -5.91 |
| 1.96 | 1.18 | 1.18 | 93.11 | 1.74 | -5.6 |
| 3.92 | 2.75 | 2.75 | 92.1 | 1.25 | -5.22 |
| 5.88 | 4.31 | 4.31 | 91.01 | 1.33 | -5.67 |
| 7.84 | 5.49 | 5.49 | 90.17 | 1.07 | -5.7 |
| 10.2 | 7.45 | 7.45 | 88.91 | 1.04 | -6.07 |
| 14.9 | 10.98 | 10.98 | 86.05 | 0.55 | -5.69 |
| 20 | 14.9 | 14.9 | 83.28 | -0.31 | -5.36 |
| 25.1 | 18.82 | 18.82 | 80.18 | -1.31 | -4.79 |
| 30.2 | 23.14 | 23.14 | 76.77 | -2.65 | -3.57 |
| 34.9 | 27.06 | 27.06 | 73.66 | -3.1 | -2.51 |
| 40 | 31.37 | 31.37 | 70.42 | -4.25 | -1.68 |
| 45.1 | 35.69 | 35.69 | 66.35 | -5.65 | -0.31 |
| 49.8 | 40 | 40 | 63.32 | -6.49 | 1.12 |
| 54.9 | 45.1 | 45.1 | 59.82 | -6.84 | 2.55 |
| 60 | 50.2 | 50.2 | 55.99 | -6.66 | 4.91 |
| 65.1 | 55.29 | 55.29 | 52.32 | -6.67 | 6.21 |
| 69.8 | 60.39 | 60.39 | 48.51 | -6.34 | 6.88 |
| 74.9 | 65.88 | 65.88 | 43.16 | -4.4 | 6.54 |
| 80 | 71.76 | 71.76 | 37.6 | -3.1 | 4.45 |
| 85.1 | 78.04 | 78.04 | 31.71 | -2.79 | 2.84 |
| 89.8 | 84.31 | 84.31 | 25 | -1.52 | 2.47 |
| 94.9 | 92.16 | 92.16 | 18.72 | 1.71 | 1.01 |
| 98.04 | 96.86 | 96.86 | 14.77 | 2.67 | -0.12 |
| 100 | 100 | 100 | 13.85 | 3.17 | -0.25 |
After the method that is provided in using the embodiment of the invention is carried out Equipment Alignment, obtain the ash axle by the look target figure that prints and go up the Lab value after the calibration and the mapping table of color data group, partial data is as follows:
The ash axle is gone up the mapping table of actual Lab value and color data group before table 2 Equipment Alignment
The a value of drawing according to table 1 and table 2 and the grey axis data distribution map of b value shown in Fig. 4 a and Fig. 4 b, can significantly find out from figure respectively, carries out curve behind the Equipment Alignment among Fig. 4 b near the ideal curve among Fig. 3.
The embodiment of the invention is also corresponding to provide a kind of output device, comprising:
Be used for each first color data group of file is converted to according to first mapping table of the first color data group of storing and the second color data group unit of the second color data group; The described second color data group is the objective vision chromatic value of target that should export of the described first color data group corresponding color data group in second mapping table of objective vision chromatic value of reality and color data group, and described second mapping table is that the look target figure by measuring equipment output obtains;
Be used for exporting the unit of described file according to the described second color data group.
This device can be display devices such as display, also can be printing equipments such as printer, printing machine.
The embodiment of the invention provides a kind of equipment calibration method and output device, set up the mapping table of a color data group and actual objective vision chromatic value by the look target figure of output before calibrating, again by searching the actual objective vision chromatic value that the objective vision chromatic value of the target that should export with each color data group equates, the pairing color data group of actual objective vision chromatic value that should equate with the objective vision chromatic value of target that the primitive color data set should be exported in the acquisition mapping table is as the output color data group of primitive color data set, and with each original data set and the upright corresponding relation of output color data establishment, showing, when printing waits output, earlier according to the corresponding relation between the color data group of primitive color data set and output, the color data class value of original document is converted to the color data group of output, show again, outputs such as printing, thereby obtain comparatively ideal output effect, reached the purpose of Equipment Alignment, because directly using the color data group calibrates, consider the correlation between each parameter, improved Equipment Alignment efficient, ease for operation and calibration effect.
Obviously, those skilled in the art can carry out various changes and modification to the embodiment of the invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (7)
1. an equipment calibration method is characterized in that, comprising:
Each first color data group in the file is converted to the second color data group according to first color data group of storage and first mapping table of the second color data group; The described second color data group is the objective vision chromatic value of target that should export of the described first color data group corresponding color data group in second mapping table of objective vision chromatic value of reality and color data group, and described second mapping table is that the look target figure by measuring equipment output obtains;
Export described file according to the described second color data group.
2. the method for claim 1 is characterized in that, the preparation method of described first mapping table is specially:
Measure the look target figure that output equipment to be calibrated is exported, obtain the actual objective vision chromatic value of each color data group correspondence;
Actual objective vision chromatic value according to each color data group correspondence generates described second mapping table;
To each first color data group, determine the objective vision chromatic value of its target that should export;
Determine the second color data group of the objective vision chromatic value of target correspondence in described second mapping table of each first color data group, and described first color data group and the described second color data group correspondence are added in described first mapping table.
3. method as claimed in claim 1 or 2, it is characterized in that, the objective vision chromatic value of target that the described first color data group should be exported is specially: the desirable objective vision chromatic value of the described first color data group correspondence, the objective vision chromatic value of the desirable objective vision chromatic value of the most approaching described first color data group correspondence that perhaps described equipment can be exported.
4. method as claimed in claim 3 is characterized in that, described color data group is specially CMY value or CMYK value or CMYKGO value, and described objective vision chromatic value is specially the Lab value.
5. method as claimed in claim 4 is characterized in that, when described color data group was specially the CMY value, the method that obtains the target Lab value of a described CMY value specifically comprised:
When a described CMY value is white point and stain, determine that its target Lab value is identical with the desirable Lab value of a described CMY value;
When M value and Y value are zero in the described CMY value, obtain in the actual Lab space, satisfying M value and Y value is that zero maximum point and the C value of a value is 1, M value and Y value are 1 corresponding point, and be 1 in described a value maximum point and C value, M value and Y value are that the Lab value of determining this group CMY value correspondence is the target Lab value of a described CMY value when finding one group of CMY value to make the desirable a value of its corresponding the most approaching described CMY value of a value in the straight line that constituted of zero corresponding point;
When C value and Y value are zero in the described CMY value, obtain in the actual Lab space, satisfying C value and Y value is that zero maximum point and the M value of a value is 1, C value and Y value are 1 corresponding point, and be 1 in described a value maximum point and M value, C value and Y value are that the Lab value of determining this group CMY value correspondence is the target Lab value of a described CMY value when finding one group of CMY value to make the desirable a value of its corresponding the most approaching described CMY value of a value in the straight line that constituted of zero corresponding point;
When C value and M value are zero in the described CMY value, obtain in the actual Lab space, satisfying C value and M value is that zero maximum point and the Y value of b value is 1, C value and M value are 1 corresponding point, and be 1 in described b value maximum point and Y value, C value and M value are that the Lab value of determining this group CMY value correspondence is the target Lab value of a described CMY value when finding one group of CMY value to make the desirable b value of its corresponding the most approaching described CMY value of b value in the straight line that constituted of zero corresponding point;
The C value is zero in the described CMY value, when M value and Y value equate, in described second mapping table, keeping the C value is zero, adjusting M value and Y value searches, up to finding one group of CMY value to make the desirable Lch space hue angle of the most approaching described CMY value of its Lch space hue angle, determine the target Lab value of the corresponding Lab value of this group CMY value for a described CMY value;
The M value is zero in the described CMY value, when C value and Y value equate, in described second mapping table, keeping the M value is zero, adjusting C value and Y value searches, up to finding one group of CMY value to make the desirable Lch space hue angle of the most approaching described CMY value of its Lch space hue angle, determine the target Lab value of the corresponding Lab value of this group CMY value for a described CMY value;
The Y value is zero in the described CMY value, when C value and M value equate, in described second mapping table, keeping the Y value is zero, adjusting C value and M value searches, up to finding one group of CMY value to make the desirable Lch space hue angle of the most approaching described CMY value of its Lch space hue angle, determine the target Lab value of the corresponding Lab value of this group CMY value for a described CMY value;
When C value, M value or Y value one are zero in the described CMY value, be zero according to the C value respectively, M value and Y value equate, the M value is zero, C value and Y value equate and the Y value is zero, Lch space hue angle adjusted value when C value and M value equate is adjusted the Lch space hue angle in the corresponding Lch value of a described CMY value, determines that the Lab value behind the hue angle of adjustment Lch space is the target Lab value of a described CMY value;
When C value, M value and Y value are all non-vanishing in the described CMY value, C value M value in this CMY value and Y value are all deducted value minimum in C value M value and the Y value, again according to C value, M value or Y value one be zero or its two be that zero method obtains Lch space hue angle adjustment amount, adjust Lch space hue angle in the corresponding Lch value of a described CMY value according to the Lch space hue angle adjustment amount that is obtained, determine that the Lab value behind the hue angle of adjustment Lch space is the target Lab value of a described CMY value;
When C value, M value and Y value satisfy grey axis data condition in the described CMY value, find one group of CMY value in the ash axle in actual Lab space, make the desirable Lab value of its corresponding the most approaching described CMY value of Lab value, determine that the corresponding Lab value of this group CMY value is the corresponding target Lab value of a described CMY value.
6. an output device is characterized in that, comprising:
Be used for each first color data group of file is converted to according to first mapping table of the first color data group of storing and the second color data group unit of the second color data group; The described second color data group is the objective vision chromatic value of target that should export of the described first color data group corresponding color data group in second mapping table of objective vision chromatic value of reality and color data group, and described second mapping table is that the look target figure by measuring equipment output obtains;
Be used for exporting the unit of described file according to the described second color data group.
7. output device as claimed in claim 6 is characterized in that, also comprises:
Be used to measure the look target figure that output equipment to be calibrated is exported, obtain the unit of the actual objective vision chromatic value of each color data group correspondence;
Be used for actual objective vision chromatic value, generate the unit of described second mapping table according to each color data group correspondence;
Be used for each first color data group is determined the unit of the objective vision chromatic value of its target that should export;
The objective vision chromatic value of target that is used for determining each first color data group is in the second corresponding color data group of described second mapping table, and adds the described first color data group and the described second color data group correspondence in described first mapping table unit.
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| JP3689325B2 (en) * | 2000-10-31 | 2005-08-31 | 富士写真フイルム株式会社 | Color reproduction characteristics correction method |
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