CN1227568C - Colour management method in digital proofing - Google Patents
Colour management method in digital proofing Download PDFInfo
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- CN1227568C CN1227568C CN 03116708 CN03116708A CN1227568C CN 1227568 C CN1227568 C CN 1227568C CN 03116708 CN03116708 CN 03116708 CN 03116708 A CN03116708 A CN 03116708A CN 1227568 C CN1227568 C CN 1227568C
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Abstract
The present invention relates to a color management method in digital proofing, which comprises the steps that an IT8 color test table is printed by a digital output device and a printing device; colors are respectively measured by a color testing spectrometer to obtain the ICC profile of the printing device and the ICC profile of the digital output device; colors are regulated to obtain corrected ICC profiles; the ICC profiles are corrected again, and the corrected ICC profiles are used as digital printing proofing drafts of the digital output device. The color regulating method of the present invention can be applied to color management in the printing industry, and can also be widely applied to color management of advertisement printing, artwork emulation, etc.
Description
[technical field]
The present invention relates to the color management method in the digital sample printing, belong to the printing industry technical field.
[background technology]
In printing industry, specimen page before the seal (final contract specimen page) mainly contains two effects: allow the user see final printed matter in advance with the printing effect of realizing, and confirm this design proposal; As the object of reference of printing house when printing color allotment, the equipment debugging, and with this as the final test stone of printing effect.
The making flow process of the preceding specimen page of the seal of traditional approach and real printing are similar, also want the color separation slice, mainly depend on the operator's that draws a design sensation, experience and skill.Not only cost height, and cycle is long, efficient is low.Digital sample printing is a kind of efficient, the high-quality advanced working method that specimen page is made before the seal, has become the main mode that the preceding specimen page of present printing industry seal is made.
Digital sample printing is by color management software, directly exports specimen page on printer, the draw a design technology of color of simulate press.The digital sample printing consumptive material is few, speed fast, colour stable, accurately control by computing machine logarithmic code output device, as long as select the color correction curve errorless, the unanimity of the color that can keep drawing a design, under the situation that early stage, the design composing was carried out in computing machine, digital sample printing mode more convenient and quicker.
The digital sample printing system is made of digital sample printing output device and two parts of digital sample printing Control Software.
Because printing and the imaging mechanism of digital output device, use pigment, the color gamut space that can show are different, the digital specimen page that obtains by digital sample printing, have that color and printing effect are inconsistent, the printing house is difficult to go to chase after problems such as look according to specimen page, these are all relevant with digital output device, color management software etc.
Though some digital output device can use the look China ink of approximate ink ingredient, the also very approximate printing of the performance of colour gamut, it costs an arm and a leg, the cost height.
In order to make digital output device can show printing effect, can adopt color laser printer; Perhaps, select color ink jet printed equipment for use in order to obtain more high-quality digital sample printing effect.Because the colour gamut that these printers can be expressed is all abundant than printing-ink, how to use overgenerous colour gamut to go the colour gamut of simulate press printing ink, depends on the Color Management Technology of manufacturer.Promptly need to solve color gamut space different of digital output device and pressroom by color management software.
Color information in common printed is blueness, yellow, magenta, black (CYMK) form, this format record be blue or green in each pixel, pinkish red, yellow, black four kinds of proportions that color is shared separately.Red, yellow, blue, black four color inks are printed on form color image on the paper products, it is widely used in four coloring agent seal technology.But its color information that can express is lacked than the color of occurring in nature, and be a kind of color expression way relevant with equipment: identical blueness, yellow, magenta, black (CYMK) coloured image print on different paper, printing equipment, perhaps same set of printing equipment changed printing ink or adjusted be provided with after, all might obtain different printing effects.So, make digital output device obtain the effect of printing true to nature by color management software, need carry out individually at the printing equipment under the particular state, there is not the pattern of putting things right once and for all.
Digital sample printing solution commonly used at present, generally adopt the following step:
1, at first, as requested and printing standard, determine all relevant datas of printing equipment, for example printing ink concentration, site propagation, with paper etc., print out color contrast index test table.
Color contrast index test table is a kind of standard testing data that have nearly thousand different color blocks, and is very universal in printing industry.
2, under the state of achromatization management, print color contrast index test table with digital output device.
3, respectively these two colors contrast index test tables are measured with the colour examining spectroscope, obtained the color data standard reference file of the international color federation formulation of color data standard reference file (color description archives) that the international color federation of digital output device formulates and printing equipment.
4, whole in the enterprising circumstances in which people get things ready for a trip caidiao opera of color management platform.Color management platform commonly used has " color management software ", " this color management software color adjusting module (O.R.I.S.Color Tuner) of ALLRED " etc.
Each color lump according to color contrast index test table, contrast this difference of two kinds of color data standard reference file that the international color federation of color data standard reference file that the international color federation of digital output device formulates and printing equipment formulates, it is whole to add and subtract tone, make both unified as far as possible, preserve obtain, adjust data (the color data standard reference file that the international color federation of revised digital output device formulates) at the color of current printing equipment under current state.
5, under the color data standard reference file condition that the international color federation of the final digital output device of determining formulates, with digital output device printing digital sample printing original text.For example: the color data standard reference file that the international color federation of the revised digital output device that can obtain with step 4 formulates is as the color data standard reference file of the international color federation formulation of the final digital output device of determining.
The colour examining spectroscope can be used for the Lab value of the color on the test paper medium.Lab is the color expression format of a kind of ICC of meeting (International Color Consortium/ international color consortium) standard, and meet color information and the device independent that the ICC standard just means that also this form is expressed, and can in different software, hardware platform, transmit and change.Can preset document with ICC and come difference between opertaing device and various printing condition, the system that acquisition can the simulate press finished product.
But, adopt above-mentioned technology, because there is the data read analytical error in the colour examining spectroscope when measuring, the color contrast index test table that printing equipment prints out also has certain deviation, direct under the color data standard reference file condition that the international color federation of revised digital output device formulates, the result who prints the digital sample printing original text with digital output device usually is difficult to the printing effect of the current printing equipment of emulation ideally, does not reach high-level technical requirement.
[summary of the invention]
In order to remedy above-mentioned defective, the color of original copy, digital sample printing original text and final printed matter is consistent, the invention provides a kind of improved color adjustment method.According to color adjustment method provided by the invention, comprise the steps:
Obtain the color data standard reference file of the international color federation formulation of revised digital output device according to above step 1-4;
Under the color data standard reference file condition that the international color federation of revised digital output device formulates, print the color test chart that color contrasts index test table or other special parameters, specific (special) requirements with digital output device.
Under all relevant data conditions of the same printing equipment of determining, the color test chart of printing color contrast index test table or other special parameters, specific (special) requirements.
With the color test chart of densitometer (as " Ai Sheli (X-Rite) " densitometer) to above digital printing, the color test chart of printing equipment printing records its blueness respectively one by one color lump, yellow, magenta, black (CYMK) value, calculate difference between the two, at " color management software ", adjust data in the color data standard reference file that the international color federation of digital output device formulates, the color data standard reference file that the international color federation of the digital output device that is optimized at last formulates according to the difference of calculating on the color management platforms such as " this color management software color adjusting modules (O.R.I.S.Color Tuner) of ALLRED ".Blueness, yellow, magenta, black (CYMK) difference also can obtain by other method, for example: the instrument that other is suitable, methods such as range estimation.
The color data standard reference file of formulating with the international color federation of the digital output device optimized, the color data standard reference file condition of formulating as the international color federation of the final digital output device of determining is with digital output device printing digital sample printing original text.
Because the color data standard reference file that the international color federation of the digital output device of optimizing formulates is through revising for the second time, thereby exist data read analytical error and printing equipment printing color contrast index test table that deviation is also arranged when having overcome, cause the unfavorable defective of result of digital sample printing original text owing to the measurement of colour examining spectroscope.
In order to improve the effect of revising for the second time, blueness, yellow, magenta, black (CYMK) difference should be accurate as far as possible; This color lump parameter, size with the employing of the color test chart of digital color test chart of printing and printing equipment printing is relevant closely.For example,, can use color lump doubly, be convenient to more accurate adjustment color than the big 1-3 of standard color block for the ease of contrast, adjustment.
Adopt color adjustment method provided by the invention, the color data standard reference file of formulating by the international color federation to the revised digital output device that obtains according to above step 1-4 carries out the secondary correction again, the color data standard reference file condition that the color data standard reference file of formulating with the international color federation of the digital output device optimized is formulated as the international color federation of the final digital output device of determining is with digital output device printing digital sample printing original text.This color adjustment method provided by the invention exists data read analytical error and printing equipment printing color contrast index test table that deviation is also arranged in the time of can overcoming owing to the measurement of colour examining spectroscope effectively, cause the unfavorable defective of result of digital sample printing original text.
Adopt color adjustment method provided by the invention, not only can be applicable to the color management of printing industry, can also be widely used in the color management of advertising painting, artwork emulation etc.
[embodiment]
Embodiment 1,
Color management method in the digital sample printing comprises the steps:
1, as requested and printing standard, determine all relevant datas of printing equipment, print out color contrast index test table.
2, under the state of achromatization management, print color contrast index test table with digital output device.
3, respectively these two colors contrast index test tables are measured with the colour examining spectroscope, obtained the color data standard reference file that the international color federation of color data standard reference file that the international color federation of digital output device formulates and printing equipment formulates.
4, whole in the enterprising circumstances in which people get things ready for a trip caidiao opera of color management platform.Contrast these two kinds of difference of color data standard reference file that the international color federation of color data standard reference file that the international color federation of digital output device formulates and printing equipment formulates according to each color lump of color contrast index test table, it is whole to add and subtract tone, obtains the color data standard reference file at the international color federation formulation of the revised digital output device of current printing equipment under current state.
5, under the color data standard reference file condition that the international color federation of revised digital output device formulates, with digital output device print color contrast the index test table,
6, the color test chart that the digital color test chart of printing of step 5, step 1 is printed with densitometer records its blueness, yellow, magenta, black (CYMK) value respectively one by one color lump, calculate difference between the two, on the color management platform, adjust data in the color data standard reference file that the international color federation of digital output device formulates, the color data standard reference file that the international color federation of the digital output device that is optimized at last formulates according to the difference of calculating.
7, the color data standard reference file of formulating with the international color federation of the digital output device optimized, the color data standard reference file condition of formulating as the international color federation of the final digital output device of determining is with digital output device printing digital sample printing original text.
Embodiment 2,
According to the color management method in the digital sample printing of embodiment 1, but described color management platform refers to " color management software " or " this color management software color adjusting module (O.R.I.S.ColorTuner) of ALLRED "; Described density is counted " Ai Sheli (X-Rite) " densitometer.
Embodiment 3,
According to the color management method in the digital sample printing of embodiment 2, but described color test chart is not limited to color contrast index test table.
Embodiment 4,
According to the color management method in the digital sample printing of embodiment 2,3, but described blueness, yellow, magenta, black (CYMK) difference obtain by range estimation.
Embodiment 5,
According to the color management method in the digital sample printing of embodiment 2,3,4, but the color test chart of the digital color test chart of printing of described step 5, step 1 printing adopts the color lump doubly than the big 1-3 of standard color block.
Embodiment 6,
According to the color management method in the digital sample printing of embodiment 5, with densitometer Y.M.100 color lump in the digital color contrast index test table of printing of step 5 is measured the K.=0.66C.=0.29 M.=1.49 Y.=1.47 that records in the step 6; The printing color contrast index test table that records is: K.=0.71C.=0.32 M.=1.55 Y.=1.61; Calculate difference between the two, on the color management platform, adjust data in the color data standard reference file that the international color federation of digital output device formulates according to the difference of calculating.Repeat above adjustment process for each standard color block of color contrast index test table.The color data standard reference file that the international color federation of the digital output device that is optimized at last formulates.The color data standard reference file of formulating with the international color federation of the digital output device optimized, the color data standard reference file condition of formulating as the international color federation of the final digital output device of determining is with digital output device printing digital sample printing original text.
Claims (4)
1, the color management method in the digital sample printing comprises the steps:
(1), with printing equipment printing color contrast index test table;
(2), under the state of achromatization management, print color contrast index test table with digital output device;
(3), respectively these two colors contrast index test tables are measured, obtain the color data standard reference file that the international color federation of color data standard reference file that the international color federation of printing equipment formulates and digital output device formulates respectively with the colour examining spectroscope;
(4), whole in the enterprising circumstances in which people get things ready for a trip caidiao opera of color management platform, obtain the color data standard reference file that the international color federation at the revised digital output device of current printing equipment under current state formulates;
(5), under the color data standard reference file condition that the international color federation of the final digital output device of determining formulates, with digital output device printing digital sample printing original text;
It is characterized in that:
Behind the color data standard reference file that the international color federation of the revised digital output device that step (4) obtains formulates, under this condition, print color with digital output device and contrast the index test table; With densitometer the color contrast index test table of this color test chart and step (1) printing is recorded its blueness, yellow, magenta, black (CYMK) value respectively one by one color lump, calculate difference between the two, on the color management platform, adjust data in the color data standard reference file that the international color federation of digital output device formulates, the color data standard reference file that the international color federation of the digital output device that is optimized at last formulates according to the difference of calculating;
The color data standard reference file that the international color federation of the digital output device of this optimization formulates is printed the digital sample printing original text as the color data standard reference file condition of the international color federation formulation of the described final digital output device of determining of step (5) with digital output device.
2, the color management method in the digital sample printing according to claim 1 is characterized in that described color management platform refers to " color management software " or " this color management software color adjusting module (O.R.I.S.Color Tuner) of ALLRED "; Described density is counted " Ai Sheli (X-Rite) " densitometer.
3, the color management method in the digital sample printing according to claim 1 and 2 is characterized in that described blueness, yellow, magenta, black (CYMK) difference obtain by range estimation.
4, the color management method in the digital sample printing according to claim 1 and 2 is characterized in that described color test chart adopts the color lump doubly than the big 1-3 of standard color block.
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| CN 03116708 CN1227568C (en) | 2003-04-30 | 2003-04-30 | Colour management method in digital proofing |
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| CN 03116708 CN1227568C (en) | 2003-04-30 | 2003-04-30 | Colour management method in digital proofing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009143647A1 (en) * | 2008-05-26 | 2009-12-03 | 永经堂印刷有限公司 | A neutral gray balance controlling method |
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- 2003-04-30 CN CN 03116708 patent/CN1227568C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009143647A1 (en) * | 2008-05-26 | 2009-12-03 | 永经堂印刷有限公司 | A neutral gray balance controlling method |
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