User Guide

GNU Image Manipulation Program
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14.10.29.2 The Contents of the ‘Mask’ Submenu
The Mask submenu contains the following commands:
• Section 14.10.30
• Section 14.10.31
• Section 14.10.32
• Section 14.10.35
• Section 14.10.33
• Section 14.10.34
• Section 14.10.36
• Section 14.10.37
• Section 14.10.38
• Section 14.10.39
14.10.30 Add Layer Mask
The Add Layer Mask command adds a layer mask to the active layer. It displays a dialog in which you can set the initial
properties of the mask. If the layer already has a layer mask, or if it cannot have one because it does not have an alpha channel,
the menu entry is insensitive and grayed out.
A layer mask lets you define which parts of the layer are opaque, semi-transparent or transparent. See the Layer Mask section
for more information.
14.10.30.1 Activating the Command
• You can access this command from the image menubar through Layer → Mask → Add Layer Mask
• or from the pop-up menu you get by right-clicking on the active layer in the Layers Dialog.
14.10.30.2 Description of the ‘Add Layer Mask’ Dialog
Figure 14.105: The ‘Add Layer Mask’ dialog