Feature #36 HSP color space, and color.brightness() #41
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Hey,
based on feature request #36, I implemented the HSP color space as explained in [1].
Additionally, similar to color. luminance(), I implemented color.brightness() that returns the perceived brightness P of HSP as a standalone function.
Missing: Interpolation between two colors in hsp. I wasn't sure about these lines in colors.coffee.
[1] http://alienryderflex.com/hsp.html