color_diff.h implements the CIEDE2000
formula for the difference between reference and sample colors, specified
in CIE-LAB, or via included conversions from sRGB or CIE-XYZ (D65 / 2 deg).
This header also implements the greedy heuristic described by Glasbey for generating a palette of visually distinguishable colors, by iteratively selecting a color maximizing the minimum CIEDE2000 distance from the colors already in the palette.
make_palette.cpp demonstrates use of these functions to generate such a
palette of visually distinguishable colors. To use,
make_palette num_colors [config_file]
where num_colors specifies the number of colors to generate, and the
optional text file config_file specifies minimum and maximum values of
CIE-LCh(ab) lightness, chroma, and hue, followed by a list of sRGB colors,
which may be interpreted as either an initial palette to be extended, or as
a set of colors to be "avoided" when generating the palette. The default
configuration is to allow all CIE-LCh(ab) values, starting with white:
0 100
0 150
0 360
255 255 255
The output is a list of the requested number of colors, one color per line, each specified by its minimum CIEDE2000 distance from the colors generated so far, followed by its sRGB values.
- Glasbey, C., van der Heijden, G., Toh, V., and Gray, A., Colour Displays for Categorical Images, Color Research and Application, 32(4) 2007, 304-309
- Sharma, G., Wu, W., and Dalal, E., The CIEDE2000 Color-Difference Formula: Implementation Notes, Supplementary Test Data, and Mathematical Observations, Color Research and Application, 30(1) 2005, 21-30