[masraum]

Originally Posted by Pazuzu

Here's a single raw, with the levels set to show the watermarking, dust, vignetting, and dark noise. The watermarks are (of course) dithered, so they don't go away with dark subtraction or stacking...

I paid for the full version, I'll see what I can do this weekend with it.

OK, that makes more sense to me. The watermarking are the dark dashes. I assume the dust is represented by the donuts?

When you stacked the images, the watermarks didn't always exactly align, so didn't realize that was what it was.