Clear Underlying Image.
Sometimes when using a plugin it can be useful to be able to clear the underlying image so that you just see the result after applying, rather than the original image showing through areas that have less than 100% alpha. To do this, just hold down the shift key and click the "normal" option under blend mode.
For the following example I created a 2 layer image in Photoshop. I filled both layers with white and applied difference clouds repeatedly to the top layer to build up some detail. When I'd done this I cut some holes in the top layer by making three circular selections and deleting their contents so that the bottom layer was showing through ( the white areas ).
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