### 7.43. Subtract Alpha from Selection

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

图 16.104. Applying “Subtract Alpha from Selection”

Original image.

Layers of the original image.

Resulting image: 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

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