What I did was took one 390x390 image (call it the "covert") and did a 25-pixel radius gaussian blur, took the other one (call it the "overt") duplicated the layer, darkened the top copy (by mapping, using the "layers" dialog, the colors 0..255 to 0..127) and gaussian blurred it to a radius of 5 pixels, set its transfer function to "subtract" and lightened the bottom copy (by mapping colors 0..255 to 127..255) This accomplishes a high pass on the "overt" image. I then crank up the contrast on the overt, and paste it on top of the covert using the "burn" transfer function.
What I did was took one 390x390 image (call it the "covert") and did a 25-pixel radius gaussian blur, took the other one (call it the "overt") duplicated the layer, darkened the top copy (by mapping, using the "layers" dialog, the colors 0..255 to 0..127) and gaussian blurred it to a radius of 5 pixels, set its transfer function to "subtract" and lightened the bottom copy (by mapping colors 0..255 to 127..255) This accomplishes a high pass on the "overt" image. I then crank up the contrast on the overt, and paste it on top of the covert using the "burn" transfer function.
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