On Sun, Jun 13, 2004 at 02:45:29PM -0400, 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.
since you are starting with an image with 256 colors or less, you should
be able to easily convert the colors by using the gimp palette editor.

if the image is just browns, convert it to rgb by right clicking on the
image Image -->Mode -->RGB.  now, convert it back Image -->Mode
-->Index.  you will get the index dialog.  in this dialog you can use
the "Grays" palette.

if the image has more than just browns in it, a little extra work with
the palette editor will be necessary.  Dialogs -->Palettes will bring
the Palette Palette Dialog up.  Select the palette called "Untitled" and
right click on the dialog.  there will be a menu in which you can import
a palette with.  Select this and point the next dialog at your image.
the resulting palette can be easily edited.

you actually have what i consider a fun job for the gimp.

> 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.
heh, well the professionals and the artists understand how to make the
other color tools work for this.  they were also surprised at what the
gimp index dialog could do as well.

good luck,


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