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Load a layer or layer mask’s boundaries as a selection
You can select all the non-transparent
areas on a layer, or, if a layer mask exists, all the unmasked areas.
This is useful when you want to select text or image content that
is surrounded by or contains transparent areas, or to create a selection
that excludes masked areas on a layer.
- Do
one of the following:
To select only the non-transparent areas
on an unmasked layer, Ctrl-click (Windows) or Command-click (Mac OS)
the layer thumbnail in the Layers panel.
To select the unmasked areas on a layer that has
a layer mask, Ctrl-click (Windows) or Command-click (Mac OS)
the layer mask thumbnail in the Layers panel.
- If a selection already exists, you can do any of the
following:
To add the pixels to an existing selection,
press Ctrl+Shift (Windows) or Command+Shift (Mac OS),
and click the layer thumbnail or layer mask thumbnail in the Layers
panel.
To subtract the pixels from an existing selection,
press Ctrl+Alt (Windows) or Command+Option (Mac OS), and
click the layer thumbnail or layer mask thumbnail in the Layers
panel.
To load the intersection of the pixels and an existing
selection, press Ctrl+Alt+Shift (Windows) or Command+Option+Shift
(Mac OS), and click the layer thumbnail or layer
mask thumbnail in the Layers panel.
 If you want to move all the contents of
a layer, use the Move tool without loading a transparency mask.
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PDF (adobe.com)
