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Imatest Documentation Gamut is excellent for S = 0.2 (brown curve) and 0.4 (red curve). But compression becomes apparent just beyond S = 0.4 for magenta and blue and at S = 0.6 (green curve) for green and cyan, where the printer starts to saturate. Increasing S above these values doesn't increase the print saturation: in fact, saturation decreases slightly at S = 1. This is the result of limitations of the Epson 2200's pigment-based inks and the workings of the standard Epson ICC profile. The good performance for relatively unsaturated colors (S ≤ 0.4) is extremely important: skin tones and other subtle tones should reproduce very well on the Epson 2200. With Gamut maps, differences between printers, papers, and profiles are immediately apparent. These differences are far more difficult to visualize without Imatest Print test because each image has its own color gamut. One image may look beautiful but another may be distorted by the printer's limitations. L=0.5 xy Saturation map L=0.5 Saturation results can also be displayed in the familiar CIE 1931 xy chromaticity chart. As with the La*b* plot above, Gamuts are shown for 0 ≤ S ≤ 1 in steps of 0.2. As in the the S=1 La*b* Saturation map, the dotted lines and shapes are the ideal values (the color space used to print the pattern) and the solid shapes are the measured values. 408 of 451
Imatest Documentation Gamut is excellent for S = 0.2 (brown curve) and 0.4 (red curve). But compression becomes apparent just beyond S = 0.4 for magenta and blue and at S = 0.6 (green curve) for green and cyan, where the printer starts to saturate. Increasing S above these values doesn't increase the print saturation: in fact, saturation decreases slightly at S = 1. This is the result of limitations of the Epson 2200's pigment-based inks and the workings of the standard Epson ICC profile. The good performance for relatively unsaturated colors (S ≤ 0.4) is extremely important: skin tones and other subtle tones should reproduce very well on the Epson 2200. HSL contour plots The HSL contour plots that follow display color response in great detail, but don't contain absolute color information. For that you need the La*b* or CIE 1931 xy plots described above. They work best when the same color space is used to print and scan the target. For these plots to be displayed, Display HSL coutour plots must be checked in the Print test input dialog box. S=1 HSL Saturation plot The S=1 Figures are for region 1, which contains all possible hues (0 ≤ H ≤ 1) and lightnesses (0 ≤ LHSL ≤ 1) for maximum HSL saturation (S = 1). The HSL Saturation plot shows the saturation levels. If the print and scanner response were perfect, S would equal 1 everywhere. Weak saturation is evident in light greens and magentas (L > 0.5). Strong saturation in darker regions, roughly 0.2 ≤ L ≤ 0.4, could indicate that it might be possible to create a profile with better performance in the light green and magenta regions. Weak saturation in very light (L>0.95) and dark areas (L
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Imatest Documentation © 2009 Imate
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