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Replace edge of aliased image

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Hello. I was making a map using paint.net, and i wanted to have it aliased. I achieved this by making the whole map 2 colors, water and land. I want a border between the two, but it would be a large pain to manually draw in coastlines over thousands of pixels. Is there a plugin or script that can achieve what I want?

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Hello @cubic, you could try BoltBait's Outline Selection (part of the plugin pack, listed 26 under description):

I would select dark area (tolerance 10-20%), then create an empty layer and go to Effects > Selection > Outline Selection
Under plugin settings, disable Anti-Alias outline, for other settings everything is set to default. But you can try out different settings.
The last thing is to remove borders created at the document-canvas sides (paint them with dark color).

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