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Imatest Documentation Similar plots are produced for the L=0.5 region, immediately above the S=1 region. L=0.5 HSL Saturation map The L=0.5 Saturation map, which displays response to different levels of color saturation, is of interest for comparing different rendering intents (rules that control how colors are mapped when they are transformed between color spaces or color spaces and devices). Colorimetric rendering intents should leave saturation unchanged, at least at low S levels. Perceptual rendering intent expands color gamut when moving to a color space or device with increased gamut; it compresses it when moving to a smaller gamut. But there is no standard for perceptual rendering intent: every manufacturer does it in their own say. "Perceptual rendering intent" is a vague concept; it's hard to know its precise meaning unless you measure it. The ideal L=0.5 Saturation map would consist of uniformly spaced horizontal lines from 0.9 to 0.1. The weak saturation in the greens and magentas is visible here. From the viewpoint of overall image quality, behavior at low saturation levels is most visible. The Epson 2200 behaves very well in this region. 412 of 451
Imatest Documentation An additional Figure with L=0.5 HSLHue and Lightness maps has been omitted. Digitization and Metric Conversion for Image Quality Test Targets by William Kress discusses the use and accuracy of flatbed scanners for measuring print quality. 413 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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