In the October issue of Printing Technology , Mr. Tang Xiaoxing from Yachang Culture (Group) Co., Ltd. will introduce the application of PhotoShop in printing color management for everyone. Here, let us look at the setting method of the two color separation methods in PS in advance~
In PhotoShop, the "Separation Option" module has two color separation methods, GCR and UCR, which are mainly used to set the black version generation method and control the total amount of printing ink. The setting of these parameters does not cause a difference in the color display of the image in the display, but it has a great influence on the color rendering of the final printed product, because the printing is realized based on the principle of color subtraction, four-color ink The difference in the value of the gradation causes a significant difference in the overprinting ratio of the color, which in turn causes a difference in the final color of the print.
GCR (grey component substitution), this method replaces all the gray components in the color component with black. Regardless of the color or neutral gray in the image, all CMY color components that match the gray balance ratio are replaced by black. . GCR changes the composition of the color structure of the original image. Therefore, the degree and range of GCR should be strictly controlled according to the characteristics of printed products. For high-saturation images of landscapes, the short-black black GCR2 method can be used, and for you Chinese painting and calligraphy The GCR4 method is recommended for pictures with the ink color as the main color.
"Black Edition Generation" is specifically used for GCR color separation, which controls which tone to start with black substitution and determines the degree of black substitution. The starting point of the black substitute tone is called the GCR starting point, and the black substitution range is from the starting point to the darkest point of the dark tone. There are five kinds of "black version generation" methods and user-defined in the GCR color separation method. The "black version generation" method (shown in Figure 6) is:
No--no black, producing CMY images;
Less -40% to 100% black replacement, short black version;
Medium - -20% ~ 100% black replacement, medium black version;
More -10% ~ 100% black replacement, long black version;
Maximum value - all black substitution, full black version;
Custom--Automatically set the black-length length and black-start position as needed.
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