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Say I have a picture with some kind of irregularly repeating pattern with different bits "sticking out" at different scales. The diffuse grainy texture in the back and the larger splotches in the background. I would like to be able to create a selection to different level of details to colorize different scales differently.

I know that the high-frequency pass filter is able to capture this kind of pattern, but how can I generate a selection from it?

example

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  • Use levels to increase contrast of the layer (so the mid-gray is black). Invert if desired. Copy into a layer mask.
    – xiota
    Commented Aug 22, 2019 at 7:11
  • What is the purpose of this effort? Is this for artistic purposes? Or perhaps scientific imaging?
    – scottbb
    Commented Aug 22, 2019 at 14:37
  • It's artistic, I'd like to try coloring this picture and make it look like an archipelago in the sea
    – Three Diag
    Commented Aug 23, 2019 at 9:29

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