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An 8-bit channel that has a
white or black as its
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background. The white areas of
the channel are to be
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seen and the black areas are
to be hidden.
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A layer mask can temporarily
hide pixels on a layer so
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that the graphic designer can
experiment with
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different compositions. A
layer mask can be applied to
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the image on that layer so
that the composition can not
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be
changed.
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