[GEM-dev] Why is [hsv2rgb] implemented as an abstraction?

[chris clepper]

I should also point out that HSV/HLS/HSB/etc is not a useful color space to
deal with.  Excellent details as to why are provided by Charles Poynton:

http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html#RTFToC36
http://www.poynton.com/notes/colour_and_gamma/GammaFAQ.html#HSI

If you need brightness or saturation then use YUV which properly accounts
for non-linear aspects of color.  The 'hue' part of HSV is worthless.
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