7.43. Subtract Alpha from Selection

7.43. Subtract Alpha from Selection
	7. The “Layer” Menu

The Subtract Alpha from Selection command creates a selection from the combined alpha channels of all selected layers and subtracts that from the already existing selection.

Opaque areas are fully selected, transparent areas are unselected, and translucent areas are partially selected. The alpha channels of the selected layers are not changed.

7.43.1. Activating the Command

You can access this command

From the main menu through Layer → Transparency → Subtract Alpha from Selection.

7.43.2. Example

شكل 16.101. Applying “Subtract Alpha from Selection”

Example image and its layers.

Non-transparent pixels of the active layer have been subtracted from the existing rectangular selection.


7.42. Add Alpha to Selection		7.44. Intersect Alpha with Selection