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Time for another illustration: because I want to start the issue "colour", I chose this clear example. I created a gradient ranging from grey to pink in one direction, and below it, in the other one. Then I cutted the result in half and copied this eight times on a new doc.

The colours were, of course, carefully chosen, but the issue is there, and can be found in most pictures. I chose a grey (145, 145, 145, RGB values) and as second colour one that had much difference in Red (255), less in Green (157) and nearly none in Blue (147).

Then I applied the Unsharp Mask filter to it with several settings that are noted on the picture: