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For example, if you import a TIFF file with an alpha channel and you want to cut out part
of it without losing alpha information, you must use the Intersect blend mode. This is
also true for layers with keying filters applied.
Original alpha channel
from key.
Intersecting mask crops
unwanted opaque areas.
Replace Masks
A mask set to Replace completely replaces the previously existing alpha channel. It also
completely replaces all other masks appearing underneath it in the Layers list. For this
reason, it is unlikely that any but the bottommost mask would be set to this blend mode.
Feathering Masks
One of the easiest ways to adjust a mask is to feather its edges. Feathering a mask by a
few pixels can make the masked object blend more seamlessly with a background.
Feathering a mask by larger amounts allows you to create progressively softer edges for
various design purposes.
1204 Chapter 20 Using Shapes, Masks, and Paint Strokes