10.37.  Add Alpha Channel

"Add Alpha Channel" adds an alpha channel to the active layer. Without an alpha channel, a layer cannot have transparency or a layer mask. If the active layer already has an alpha channel (and unless it is the bottom layer of the image, it must), then the menu entry will be insensitive.

10.37.1.  Activate Dialog

  • This command can be accessed from an image menubar as LayerTransparencyAdd alpha Channel.