Hi Lea, On Nov 26, 2007 7:29 PM, Lea Wiemann <[EMAIL PROTECTED]> wrote: > Hi, > > 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. > There is no real good way to do this for arbitrary photos; For this particular photo, the best result I could achieve was by: 1. Use magic wand to select background 2. Convert the selection to a path, and convert the path back into a selection (this has the effect of smoothing the edges of the selection.. PoTrace produces better results than the GIMP sel2path plugin, I assume you have to work with standard GIMP plugins only though.) 3. Fill with white.
The result of applying this is attached. Notably this shows a smooth black outline around the object. The method I tried to convert white to black without causing an outline effected the overall color of the object too much instead. (this method was: 1. layers->transparency->color to alpha (select black); 2. flatten with bgcolor = white.)
<<attachment: fuzzy-circle-done.png>>
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