• Document: Color Appearance Models: CIECAM02 and Beyond. Outline
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Color Appearance Models: CIECAM02 and Beyond IS&T/SID 12th Color Imaging Conference Tutorial T1A, 11/9/04, 8:00-10:00AM Mark D. Fairchild <mdf@cis.rit.edu, www.cis.rit.edu/fairchild> RIT Munsell Color Science Laboratory <www.cis.rit.edu/mcsl> Outline Color Appearance Phenomena Chromatic Adaptation Structure of Color Appearance Models CIECAM02 Image Appearance: iCAM Color PDF of notes at <www.cis.rit.edu/fairchild/PDFs/CIC2004.pdf> Color Appearance Phenomena If two stimuli do not match in color appearance when (XYZ)1 = (XYZ)2, then some aspect of the viewing conditions differs. Various color-appearance phenomena describe relationships between changes in viewing conditions and changes in appearance. Bezold-Brücke Hue Shift Abney Effect Helmholtz-Kohlrausch Effect Hunt Effect Simultaneous Contrast Crispening Helson-Judd Effect Stevens Effect Bartleson-Breneman Equations Chromatic Adaptation Color Constancy Memory Color Object Recognition Simultaneous Contrast The background in which a stimulus is presented influences the apparent color of the stimulus. Stimulus Indicates lateral interactions and adaptation. Background Stimulus Color- Background Change Appearance Change Darker Lighter Lighter Darker Red Green Green Red Yellow Blue Blue Yellow Simultaneous Contrast Example (a) (b) Josef Albers Complex Spatial Interactions Hunt Effect Corresponding chromaticities across indicated relative changes in luminance (Hypothetical Data) For a constant chromaticity, perceived 0.6 colorfulness increases with luminance. 0.5 As luminance increases, stimuli of lower colorimetric purity are required 1 10 to match a given reference stimulus. y 0.4 100 1000 10000 10000 1000 100 10 1 0.3 Indicates nonlinearities in visual processing. 0.2 0.2 0.3 0.4 0.5 0.6 x Stevens Effect 1 Perceived lightness contrast increases with increasing adapting luminance. As adapting luminance increases: dark colors look darker and light colors look lighter. L (Dark) L (63 dB) Indicates luminance-dependent nonlinearities. L (79 dB) L (97 dB) 0.1 0.1 1 Y/Yn Stevens & Hunt Effects 0.1 cd/m2 1.0 cd/m2 10 cd/m2 100 cd/m2 1000 cd/m2 10,000 cd/m2 Bartleson-Breneman Perceived lightness as a function of relative luminance for various surround relative luminances 100 90 Apparent contrast in complex stimuli (i.e. 80 images) increases with increasing surround luminance. 70 60 Decreased surround luminance increases the 50 brightness of all image colors, but the effect is 40 greater for dark colors. 30 Lightness (Av

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