Would that be using different "weights" for different colors, i.e., a picture using
only solid rgb would have different gray levels? A very easy way to do it, of
course, would just be to average the rgb values, but somehow I don't think that's
what you want. Then there's hue-chroma-value (referred to as
hue-brightness-saturation in most programs), which would make more sense. I don't
know those, but they should be easy formulas to find.

Remco de Korte wrote:

> There was a discussion in one of the groups on this server not long ago about
> converting rgb to grayscale values. I've been looking for that thread but can't
> find it. Some formulas were mentioned and I'd like to try those again.
>
> Houdoe!
>
> Remco

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