Paint > Setting Brush Attributes and Modes > Brush Attributes > 
Brush Jitter
 
 
 

The Jitter attribute randomizes the brush strokes applied to the image. A high value produces a greater dispersion of paint, while a low value produces a greater concentration.

NoteYou can use any attribute mode with the Jitter attribute.

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Jitter attribute value at 10

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Jitter attribute value at 100