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FLEXO Magazine : October 2011
Illustration 2: The two color gamuts displayed are AdobeRGB1998 which is a typical RGB working space from Adobe Photoshop and GRACoL Coated 1 which is a typical CMYK working space of a commercial printing press. graphics and displays. This rendering intent moves all colors that are outside of the source gamut to the outside edge of the destination gamut. All colors in gamut are moved slightly outward to create the illusion of more saturation or intensity. This intent creates bright, bold vivid graphics that may not be color accurate. The perceptual rendering intent (Illustration 3b) is used for scanning and color correction. This rendering intent moves all colors that are outside of the source gamut to the outside edge of the destination gamut. All colors in gamut are moved slightly inward to retain proper tone distribution. The issue here is that images can appear flatter, which leads to the colorimetric rendering intent. The colorimetric rendering intent (Illustration 3c) moves the colors outside of the source gamut to the outer edge of the destination gamut, just like the other two intents. The differ- ence is when colors are in gamut, they are left alone. The variation comes with the absolute and relative colorimetric rendering intents. The mapping of colors is the same for the two colorimetric rendering intents with the exception of mapping the white point of the media. Absolute colorimetric maps the white point of the source profile (What do you want me to look like?) to the destination profile (Where are you sending me?). A good example of this is inkjet proofing on a bright white media. The media on the printing press may not be as bright, so we need to reduce the brightness by tinting the inkjet pa- per with ink. The relative colorimetric rendering intent ignores the white point of the source profile, therefore it is not applied to the destination profile. Now that we have a better understanding of ICC profiles and rendering intents, we will quickly discuss the CMM, as 88 FLEXO oCToBeR 2011 www.flexography.org