A square with all possible hues (0 ≤ H ≤ 1) and lightnesses (0 ≤ L HSL ≤ 1), where all colors have maximum saturation ( S = 1). The most visually saturated colors occur where L HSL = 0.5. (The HSL subscript is used to distinguish it from CIELAB L.) L = 0 is pure black 1 is pure white. S = 0 for grays S = 1 for the most saturated colors for a given Lightness value. S = Saturation = max(R,G,B)/min(R,G,B).(0 to 6 is used in the Figures below for clarity.) H = Hue varies from 0 to 1 for the color range R→ Y→ G→ C→ B→ M→ R (horizontally across the image on the right). ![]() The test pattern, shown (reduced) on the right, was generated using the HSL color representation. Prints usually appear weak in the absence of truly deep black tones. Tonal quality is strongly correlated with Dmax- the deepest attainable black tone, as well as the tonal response curve. Best results are obtained by scanning it next to a step chart such as the Kodak Q-13 into a file tagged with Adobe RGB (1998) color space.Ĭolor quality is a function of gamut- the range of saturated colors a print can reproduce, as well as overall color response- the relationship between file pixels and print color. Scan it on a flatbed scanner, preferably one that has been profiled. ![]()
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