Off the top of my head: change the image to RGB (Image:Mode:RGB ?). From here 
on you have a few options. For instance, Layer:Colors:Hue/Saturation and dial 
saturation way down. If you want you could also change the hue instead and 
turn the brown shades into shades of another color. Then save your image as 
GIF again (it will convert it back from RGB to Indexed for you).

Good luck,

On Sunday 13 June 2004 20:45, Rick Pasotto wrote:
> I have a fairly simple gif image that has various shades of brown. I'd
> like to have the same image but with various shades of grey instead.
> What would be the easiest way of doing this? Is there an algorithmic way
> of converting the brown range to a grey range? Given that I could easily
> change the values in the colormap.
> I'm very much a novice at this sort of thing so I'm just fumbling my way
> around. Any help would be much appreciated.
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