Is there a way to adjust the opacity of the HUD-preview in the stamp tool?
(Clone Source Overlay)
Or do you mean when adjust the size of the brush, a way to adjust the opacity?
What version of photoshop are you using?
In photoshop cs6/cc under photoshop preferences(Edit)>General and uncheck Vary Brush Hardness based on HUD vertical movement
Then the vertical movement adjusts the opacity
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