There’s an old technique in chemical photography for making etching-like images. You sandwich a negative and a positive of the same image together just slightly out of register, and print the whole thing on lith film, then you make your print from the lith.
I thought I’d see what happened to one of the firehouse pictures with that treatment. With my darkroom a storage area, I turned to Photoshop. I converted the image to B&W, duplicated the result as another layer, and set the blend mode to difference. I zoomed in, and moved the top image a tiny bit. Then I added a Levels layer on top and moved the white point way down. That got fiddly, so I added another Levels layer and did the same thing.
Then I zoomed out to see what the whole image looked like.
I zoomed in. The image came back. I zoomed out again. Nothing but black. Closing Ps and reopening the image showed approximately the right thing, but much darker than the Lr presentation, and darker than a JPEG file exported from Lr.
I exported to Lightroom, and it looked fine:
Photoshop version 14.2.1 x64, if anyone wants to try to duplicate my experience.
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