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Is it problems with my graphic card? How do I know?
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Which version of Photoshop and OS.
Have you tried unticking Use Graphic Processor in Preferences?
By the way, are you in Quick Mask Mode, that might account for the pink?
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I have ps cc 2017 by the way
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Huh. That certainly looks like a video card glitch. That's not the red mask overlay. Laggy brush would indicate the same thing.
Maybe you got a driver update through Windows Update? If so, a better idea is to go to the manufacturer's site (NVidia/AMD). They will probably have an even newer version (Windows Update is usually far behind).
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If the layer visibility is on, the mask turns red:
Or you had an active selection and pressed Q to engage the Quick Mask mode. This will save with the file and reappear when the file is reopened.
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Don’t forget to restart Photoshop after turning off »Use Graphics Processor« in the Performance Preferences (Photoshop > Preferences > Performance > Graphic Processor Settings).
Could you please post a screenshot to illustrate your problem?
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this is how it looks like. Today the pink color is gone but ps is buffering a lot when I use the brush..