I'm trying to use the apply image tool for bringing back some texture, but all I can get in Subtract mode is a gray screen......I chose the active layer I'm working on (which is a duplicate of the background), RGB channel, subtract, 100% opacity, scale 2, offset 128...that's it....and still a gray screen. There should be an outline of my image, much like I would get under high pass, but it's just a gray layer.
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