The Subtract from Selection command
creates a selection in the current layer from the Alpha Channel. Opaque
pixels are fully selected, transparent pixels are unselected, and
translucent pixels are partially selected. This selection is
subtracted from the existing selection. The Alpha
channel itself is not changed.
7.41.1. Activate the Command
You can access this command from the image menubar through
Layer → Transparency → Subtract from Selection.
7.41.2. Example
Figure 16.125.
Applying “Subtract from Selection”
Non-transparent pixels of the active layer have been subtracted
from the existing rectangular selection.
