redshift-1.12
- which contains x,y chromaticities as well as decimal and integer/hex RGB data. Unfortunately, the decimal values used for Redshift are not gamma-corrected while the others are. The gamma correction is part of the sRGB specifications and is described in detail at http://en.wikipedia.org/wiki/SRGB. It can roughly be approximated by a power law with an exponent gamma about 2.2. Omitting this correction results in exaggerated color values. A minor issue concerns the standard whitepoints which are slightly off the Planckian locus. In particular, D65 (which corresponds to maximized RGB=1,1,1 in sRGB) contains slightly more green than 6500 K blackbody color. The developers of Redshift solved this by rescaling the RGB values to match 1,1,1 at 6500 K. This, however, leads to slightly incorrect colors.