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You can adjust the transparency of a mask to control the extent to which pixels in the image are protected from changes. When you adjust the transparency of a mask, you use a grayscale representation of the mask. Any color that you apply to the image appears in its corresponding shade of gray; therefore, the darker the shade that is applied to the mask, the less the color and effects can change the image. For example, if you use a brush to apply a color with a grayscale value of 127 (the midpoint of the 256 shades of gray) to an image area, this area receives only 50 percent of any effect that is later applied to it.
Because you are editing a grayscale representation of the mask, you can use a color, object, effect, or another mask to modify the transparency of the mask. You can also change the transparency of the mask by pasting images from the Clipboard; the grayscale values of the pasted images are applied to the mask.
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Click Mask  Paint on mask. |
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Click Mask Paint on mask. |
The darker the shade of gray applied, the less editable the underlying pixels become.
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