Getting To Know Layers . ... Layers in an image can be any size. ... You have the ability to toggle the visibility of a layer, so that it does not contribute to the final image. ... The layers dialog, with the Ops menu expanded . The primary tool for working with layers in GIMP is the Layers dialog. This gives you an overview of all the layers in an image, and provides the toggled areas for linking and visibility. ... You can also toggle a layer's Preserve Transparency option. ... Step 1 | ...