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This is one image I've been fighting with for a while:



These "honeycomb" patterns are very hard to filter (in the dark blue, and less in the brown). Turning greyc way up looks like garbage. I can clean it up with a fairly heavy surface blur, but there's got to be a better way.

I tried warpsharp before greyc. It helps a bit, but since it's shrinking screening dots, it changes the color. The warpsharp version is noticably darker.