"scott" <sco### [at] scottcom> wrote:
> > Values for RGB are about responses to light in three frequency ranges.
> Note that allowing negative values in RGB is not the same as allowing a
> negative brightness.  RGB of (-1,0,-1) doesn't make much physical sense, but
> (-5,100,-5) might correctly describe the colour of a green LED.

It's possible that overlaps between different colours' response profiles might
leave one feeling that a source peak has been represented with inappropriate
responses in one of the targets. I can see you wanting a negative value to
compensate for that. Green LED might be a good example, because, despite being
monochrome, it might attract weak responses from red or blue, in which case,
you change the response profiles, rather than mess about with negative numbers.
(?)

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