Justin Johansson wrote:
> Can anyone please suggest a decent algorithm for
> determining a "color distance" metric between
> two colors? The requirement is to come up with
> a good algorithm for contrasting a computed color
> from another color.
>
> Should this algorithm (function) be dependent upon
> whether the color model be additive (aka RGB) or
> subtractive (aka CMYK) or other?
>
In the imaging industry (printers, scanners and screens), we
usually use the L*a*b* [1] or L*u*v* [2] color spaces. Pythagorean
distances in these spaces give reasonably good results, but more
advanced measures have been developed [3] if you need more precision.
Jerome
[1] http://en.wikipedia.org/wiki/Lab_color_space
[2] http://en.wikipedia.org/wiki/CIELUV_color_space
[3] http://en.wikipedia.org/wiki/Color_difference
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