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I have this image: enter image description here

I want to paint a lighter blue on the left cliff that flows along the border like so: enter image description here

Doing it by hand is very hard and messy. Is there any way to automate this? If so, how do you do it?

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I had a quick go using Outer Glow.

Use the wand to select the left cliff.
Copy then paste, which will lift it to a new layer.
Add a Layer style - Outer Glow with high opacity, zero spread, size as your 'border' thickness, range 1% [& colour bright aqua just to make it very obvious ;) Technique soft or precise ..take your pick, depending on how hard you want the edge to be.

enter image description here

Stroke might also be an option, but you'd have to re-mask your outer edges.

  • I had never thought of that! Thanks for the help! – Marc Mar 26 at 11:12

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