7.43. Subtract Alpha from Selection

7.43. Subtract Alpha from Selection
	7. Il menu «Livello»

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. Attivazione del comando

You can access this command

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

7.43.2. Esempio

Figura 16.101. Applying «Subtract Alpha from Selection»

Example image and its layers.

I pixel non trasparenti del livello attivo sono stati sottratti dalla preesistente selezione rettangolare.


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