Metamerically stable RGBW display
First Claim
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1. A method to design a metamerically stable RGBW display, the method comprising:
- accessing a reference spectral power distribution (SPD) function for a white color primary;
accessing a first test SPD function for the white color primary for a display based on a first set of display parameters;
computing reference XYZ values based on the reference SPD and color matching functions for N observers;
computing first test XYZ values based on the test SPD and the color matching functions for the N observers;
translating the reference XYZ values and the first test XYZ values into color values in a perceptually uniform color space to generate reference color values and first test color values, wherein the perceptually uniform color space comprises the ICtCp color space;
computing first difference values based on the reference color values and the first test color values; and
computing a first measure of metameric stability based on the first difference values.
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Abstract
Methods for designing metamerically stable RGBW displays are presented. Display parameters are selected so that given a reference spectral power distribution (SPD) for the white color primary (e.g., one based on D65), and a test spectral power distribution for the white color primary, deviations in color appearance measurements between the two SPDs among N different observers are minimized. Given a display with a metamerically stable white (W), given linear input R, G, and B values, output R, G, B, and W values are generated to optimize metameric stability instead of reducing power consumption or to increase total brightness.
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14 Claims
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1. A method to design a metamerically stable RGBW display, the method comprising:
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accessing a reference spectral power distribution (SPD) function for a white color primary; accessing a first test SPD function for the white color primary for a display based on a first set of display parameters; computing reference XYZ values based on the reference SPD and color matching functions for N observers; computing first test XYZ values based on the test SPD and the color matching functions for the N observers; translating the reference XYZ values and the first test XYZ values into color values in a perceptually uniform color space to generate reference color values and first test color values, wherein the perceptually uniform color space comprises the ICtCp color space; computing first difference values based on the reference color values and the first test color values; and computing a first measure of metameric stability based on the first difference values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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