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Correct feathering by subtracting white

Sep 7, 2012, 14:30 (This post was last modified: Sep 7, 2012 14:33 by spiderplant0.)
Post: #1
Correct feathering by subtracting white
I have some round PNG icons where the pixels are either fully opaque or fully transparent. They look fine on a white background but are no use on a dark background.

E.g see the orange icon attached. Ideally, the edge of the round icon would be semi-transparent orange so that it would merge nicely into either a light or dark background.

So, is there any tool in the GIMP that can help me correct the feathering? I.e. subtract the white from the pixels to leave a semi-transparent orange.

I.e. convert...
pure-white -> fully-transparent
light-orange -> semi-transparent fully saturated orange
fully saturated orange -> leave unchanged

   

.xcf  temp1.xcf (Size: 6.24 KB / Downloads: 41)
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Sep 7, 2012, 17:02
Post: #2
RE: Correct feathering by subtracting white
See "Colors/Color to alpha", and check the "Background removal" link in my signature fro proper use.

Now answering your questions on
https://Gimp-Forum.net
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Sep 7, 2012, 18:55
Post: #3
RE: Correct feathering by subtracting white
Thanks - that worked.
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