rgb = SRGBGammaUncorrect(RGB)

Undo standard sRGB gamma correction, taking [0-255] -> [0-1].

See XYZToSRGBPrimary for comment on evolution of the standard
and of this implementation.

See comments inn XYZToSRGBPrimary for info on standard.

2/9/06 dhb Wrote it.
7/8/10 dhb Rewrote to match current standard.
8/16/10 dhb Fix typo in header.

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