[R] Convert RGB-sRBG

[Dieter Menne]

Barry Rowlingson wrote:
> 
>  "8-bit color" graphics often refers to a situation where each pixel is 8
> bits, and the colour comes from a 256-colour palette lookup table.
> 

If you really have a 8 bit palettized colour lookup, as Barry assumes, you
better use one of the build-in conversions, for example from grDevices.
However, this means that you need to be a bit more specific where you get
the 8-bit values from.

Dieter


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