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I'm having really weird brush issue with photoshop. It is creating rainbow effect. Please help
You would be seeing 'Banding'. See info in this site-
It becomes very apparent if it is brightened up. If you search for soft brush banding you'll find lots of hits. i.e.
Photoshop Soft Brush banding problem - Adobe Support Community - 10454228
Are you working in full colour or just B&W?