10.41.  Alpha to Selection

"Alpha to Selection" transforms the active layer's alpha channel (which encodes transparency) into the image's selection. Opaque areas become fully selected, transparent areas unselected, and translucent areas partially selected. The other operations in this group do similar things, except that instead of completely replacing the existing selection with the selection produced from the alpha channel, they either add the two selections, subtract the alpha-selection from the existing selection, or create a selection that is the intersection of the two.

10.41.1.  Activate Dialog

  • These commands can be accessed from an image menubar as Layer->Transparency->Alpha to Selection

  • or from the pop-menu you get by right clicking on the active layer in Layer Dialog.