On the tool box "filters>colors>colortoalph"  click on the color square
and set it for your purple.

Once you have changed the purple to alpha, I would drop a black layer
under the original layer and there you have it.  Purple to black.  This
will only work with one shade of purple, however.

Estevez Cherie J DLVA wrote:
> 
> How do I change one color to another on an image?  I have an image where I
> want to change all the purple to black......
> Thanks.....Cherie

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