How to minimize the color lost in ICC color management
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ICC's color management, there are other methods is CMM (Color Management Modules Microsoft), there is another CMM (Color Matching Method) plus a Color Engine (Adobe), there is a CMS (Color Management System) system Like Apple's ColorSync or Kodak, the PCS Profile Connection (ICC Specifications) is the space for color conversion, or the RCS Reference Color Space (Adobe).
ICC special terms, Input profile (color space to PCS), Output profile (PCS to color space) and display (Display), Device link, Color space, Abstract, Named color (ie Pantone, HKS), color space mode can It is CMYK, Grayscale, RGB, Lab/XYZ. Device link is to say 2 ICC or 3 ICC to do the link action, one is the Input print, the Output is the digital sample, you can link the two ICC together, the two are linked together by a CMS software. The Color Engine does the conversion, so today, assuming that the colors made by RIP are not accurate, you can use Device Link, which can be combined into three. For example, if you enter the color of Japan today, but the print is for the United States, so you can print the manuscript like the American standard, Input is Japanese color, the simulation object is SWOP, and the output is a printing machine, so you can combine it. Three. There is also a relatively poor paper to play a better color gamut, so that the color gamut is reduced one by one, then the level of the hit is much better than turning the large color gamut directly into the level of the small color gamut, so the color gamut Conversion is of course also a technical issue.
ICC Basics is already very good, but there seems to be some improvement, because some data will be lost when gamut compression, is it possible to find a method that can be lost the least, that is, Workflow does the color correspondence table. ICC's computing space is actually a 3X3 matrix, from Gamma's RGB to White point to PCS's XYZ, then we can do more matrix, so that the color can be more accurate. Also, CMM will have different results in different profiles (RGB, CMYK, Grayscale, Lab). The other method is Workflow. The input Reference is the data of Lab. When you do Contone, you can go to Proof. After Proof, you can do Measurement. After Measurement, you can do Compare. After comparing, do Proof, Proof. After finishing, go to Measurement and go to Compare, so you can make the color point of each color block very accurate, and the error can really be below 1. This kind of Workflow Tbale way is to give feedback and you can do the color. More precise.
The proof of the dot is the same principle, that is, the point of input, changing the size of its dot, is the amount of Lab data measured, the relative Engine to convert, after the dot size is changed, to meet the Lab data, the same is done Match. Because the dot is enlarged, it can also be simulated when the dot is hit. Generally speaking, the dot must be simulated by Dot Gain, because the whole color will be accurate when Dot Gain is simulated.