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Hi, I installed gimp a while ago and sharpened worked for a bit then stopped. Now it doesn't show as highlighted? Or whatever you call it, I try to click it and it doesn't work for me? I operate on Windows 10 Vista. I also put a picture below to show what I mean.

That menu entry, Select -> Sharpen is only active when there is an active selection. Do you have an active selection ?

See the Gimp Docs https://docs.gimp.org/2.10/en/gimp-selec...arpen.html

Maybe you want one of the filters from Filters -> Enhance such as Unsharp mask or a wavelet decompose.