I seem to be getting this error when I click ok.
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I restarted gimp and it didn’t give any error but the transparent parts are still black for me.
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Huh. I didn’t have this issue. You may have mixed versions of gimp installed, may want to uninstall and reinstall.
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This has saved me
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I wrote a javascript app that automates this process. It uses the same algorithm as the alpha-bleeding program I posted a while back, but is more accessible since you don’t have compile it yourself. Most importantly, you can run it entirely from your browser!
You can access it at
http://js.do/rootmars/alpha_bleed_js (right side of the page)
or
https://pastebin.com/raw/81QpWtsv (save this as an .html and run it in your web browser)
How to run:
- Open the page.
- Click choose file and select the file you want to bleed.
- An image should appear in a black box at the bottom of your page. Save this image.
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Love it. Does it just do alpha bleeding but does it also double the size of the image?
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It just bleeds. Any reason why you’d have to double the size, though?
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The second part of the tutorial is showing that if you want a 50x50 image to be clearer, you should double its size. It said something about aligning it to a grid and that you can’t just simply resize it, though, so it makes sense that your tool doesn’t have that feature.
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hmm.
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I’ve been using your article to make my UI’s look nicer, but recently I’ve encountered a problem which is if I use offset the whole time to make my images crispier then they will not scale on all devices. I assume there’s no way to make image look crisp while using scale?
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Sadly not :^(
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To add on to this topic, I would strongly consider using these same methods mentioned in the OP for MeshParts. Consider this example:
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For Photoshop users:
Don’t download any plugins, photoshop has it built-in.
Layer > Matting > Defringe.
I usually enter betweeen 2-10 pixels to be safe, doesn’t really matter most of the times.
Black outlines? Vanished!
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This is going to help so many new UI designers out there! Amazing tutorial, Quenty! 
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I’d still recommend the original solution, because after trying that for a few minutes:
- The bleeding can clobber the color of visible pixels.
- The edges can get “chipped”.
- Sometimes it flat doesn’t work – note that in the first image, the outermost edges of the corner bits pretty much did not bleed outwards at all.
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True! Forgot to mention that it doesn’t handle stuff with opacity very well. The most common example would be drop shadows or any type of glow.
I’ve never noticed a major change around thin strokes though. Thanks! 
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Very sorry for the bump, but the GIMP solution isn’t working for this one image.
After importing it into GIMP, resizing the canvas and then doing the fix, I get this result.
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