> Is it possible to make all pixels of a given colour transparent? I've
> just started playing with the gimp and am a bit stuck. Basically I want
> to duplicate a selection in the background layer, put it in a
> transparent layer with only the non-white pixels opaque. Maybe there's
> a better way to do this?
Add layer mask, Select by colour on layer, activate mask, fill
selection with black.
Or, select by colour, quickmask, copy the mask (in the channels
dialog), and apply that mask as a layer mask.
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