This was so simple I'm almost embarrassed to upload it. I took this image, copied the blue channel as a layer, and set blend mode to luminosity. That's it.
Well, OK, I did fiddle just a tad with the blend-if controls, but that was an afterthought just to bring out a bit of the darkest shadows.
Well, OK, I did fiddle just a tad with the blend-if controls, but that was an afterthought just to bring out a bit of the darkest shadows.
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