A field guide to digital color by Maureen Stone

By Maureen Stone

Annotation Maureen Stone's box consultant to electronic colour offers a survey of electronic colour with specified emphasis on these fields vital for special effects. The booklet presents the root for realizing colour and its functions, discusses colour media and colour administration and using colour in special effects, together with colour layout and choice. The booklet offers a advisor for somebody who wishes to  Read more...

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Extra resources for A field guide to digital color

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14 1 Color Vision Figure 15. CIE 1976 chromaticity diagram showing the spectrum locus, the purple line, and the black-body curve. The transformation from CIE XYZ is shown in the equations. 5 x One major concern with the 1931 chromaticity diagram is that distances are not proportional to perceptual differences in color. 1 units of each other in the reddish (lower right) part of the chart will be perceptually more different than two colors the same distance away in the greenish (upper left) part of the chart.

A plot of relative luminance (Y) to the 1/3 power is included for comparison, showing that the translation and scaling included in the L* equation make a significant difference in the shape of the curve. 43, not 1/3. There is no single definition of a perceptually uniform lightness scale. The size of the samples, the background they are displayed against, and the overall viewing conditions all affect the results. For example, Figure 9 shows how three identical gray scales with different backgrounds vary in perceived spacing.

The cube root function is replaced by a linear one, scaled and offset so that the slopes will match whenever the Equations for CIE 1976 L , a , b (CIELAB) „ ^w W 1/3 Y 16 L = 116  Yn 116 ^w a = 500 ^w b = 200 X Xn Y Yn w W1/3  w W1/3  Y Yn Z Zn W1/3 „ W1/3 „ Xn , Yn , Zn are the tristimulus values of the reference white. 787 + in the equations above. Vn Vn 116 If Equations for Hue (hab ) and Chroma (Cab ) w W =1/2  b 2 2 hab = arctan = a + b C ab a Figure 4. The mathematics of CIELAB, including the basic equations plus the specification for hue and chroma.

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