Photoshop CC / Mac (also occurs in CS6, I just never took the time to document it)
Create a gradient mask from 0 - 255, the mask contains a dot pattern in the area that extends beyond the gradation and should be a solid 0,0,0. The dot/pattern has a value of 1,1,1. The gradient was created with in the blue guides (see screen grab) with dither on. The dither is expected within that range but not beyond the gradation. I have tried with and without the "use Graphics Processor" checked.
To test this it's easiest to see against a transparent background, and enhancing with levels.
Is this a known feature
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
Image may be NSFW.
Clik here to view.
