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to an existing selection. The alpha channel itself is not changed.
creates a selection in the image from the pixels of the active
layer according to their transparency. Opaque areas are fully
selected, transparent areas are unselected, and translucent areas
are partially selected. This selection is
The other commands in this group of operations are similar,
except that instead of adding to the existing selection with
the selection produced from the active layer, they either completely
replace the selection with a selection produced from the alpha
selection, subtract the alpha selection from the existing selection, or
create a selection that is the intersection of the two.
Activating the Command
Applying “Add to Selection”