On Mon, 26 Nov 2007 03:59:23 -0500
Lea Wiemann <[EMAIL PROTECTED]> wrote:
> I'd like to turn a black background into white, or transparency (in
> which case it should look cut if displayed on a white background). My
> practical use case is photos of objects with black backgrounds that I'd
> like to improve for Wikipedia. The problem is that the boundary between
> background and object is usually fuzzy.
> I've created a pair of example images (attached): Say I start off with
> the image fuzzy-circle.png (a gray-patterned circle on a black
> background); what I would like to get is something like
> fuzzy-circle-goal.png (the gray-patterned circle on a white background)
> -- but that seems pretty hard to achieve: If I "select by color: black"
> and then cut the selection, the corners look either aliased/"too sharp"
> (for high thresholds in the select-by-color tool), or they have dark
> pixels in them (for low thresholds). Selecting the black background,
> growing the selection (2px), feathering it (2px), and then cutting the
> selection *kinda* works, but it cuts off the blurry part of the object
> Any ideas on this one?
If you are using 2.4, Colours->Colour to alpha
or in 2.2 Filters->Colours->Colour to alpha
After that, make a new layer and fill with whatever colour you want
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