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Layer masks

A layer mask is an 8-bit grayscale channel that has white or black as its background color. By default, white areas on a layer mask permit pixels to be seen, black areas hide pixels, and gray areas partially mask pixels. You can use a mask to temporarily hide pixels on a layer so you can view the rest of the composite picture without them. Later, you can modify the mask, apply the mask effect to make it permanent, or discard the mask altogether.




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