Perceptual, also called Picture or Maintain Full Gamut. Generally recommended for photographic images. The color gamut is expanded or compressed when moving between color spaces to maintain consistent overall appearance. Low saturation colors are changed very little. More saturated colors within the gamuts of both spaces may be altered to differentiate them from saturated colors outside the smaller gamut space. In the diagram on the right, the left and right of the color space blocks represents saturated colors; the middle represents neutral gray. Perceptual rendering applies the same gamut compression to all images, even when the image contains no significant out-of-gamut colors. Bruce Fraser points out that for an image with unsaturated colors, e.g., with pastels, Relative Colorimetric rendering may produce a slightly more accurate result. Perceptual gamut mapping is mostly reversible; it is most accurate in 48-bit color. None of the other rendering intents is reversible..Relative Colorimetric, also called Proof or Preserve Identical Color and White Point. Reproduces in-gamut colors exactly and clips out-of-gamut colors to the nearest reproducible hue. Not reversible. See diagram. Bruce Fraser says, "Look at the relative gamuts of your source and destination: The same image may need different rendering intents for different output process. For example, an image might benefit from perceptual rendering when printed to an inkjet printer, but when the same image is going out to the much larger gamut of a film recorder, relative colorimetric rendering might work much better. If an image doesn't contain any important strongly saturated colors, you'll probably get a better result using relative colorimetric rendering than you would using perceptual.
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