In GIMP, after adding a layer mask, and editing, is there a way (or even a plugin) to let you view the layer mask right on the canvas? I know that you can see a miniature copy of the layer mask in the Layer Dialog on the side (right next to the miniature copy of the layer), but I want to know if you can just view it?
(I suppose alternatively, I could do a greyscale layer and copy that layer onto the mask, but I was more interested in if there was an easy one-click method to make this happen.)
Answer
In the image menu, just toggle the Layer->Mask->Show Layer Mask when the layer of interest is active. Or, just Alt+Click on the miniature of the mask, on the layer’s dialog (again to turn its view off).
Some Window managers capture “Alt + Click” – (that is, the control is used to move the Window around, and GIMP itself never knows about the click). If that is your case, Ctrl + Alt + Click on the mask thumbnail instead.
Attribution
Source : Link , Question Author : Michael Plautz , Answer Author : jsbueno