Is it possible to combine two versions of the same image to improve its resolution?
I'm often scanning images at very high resolutions, and even if you set up and clean everything carefully, very tiny disruptive factors like a mote of dust, a ream on the scanner surface, an ever-so-slight hiccup of the scanner sensor that materialises in a blur or 2,3 missing lines of pixels and the like can slip through and remain visible in the final image. Usually it's not a big deal (nothing the stamp tools can't fix), and if it is, I do another scan and clone a portion of the new scan into the affected area of the old one.
But it got me thinking back to the techniques I used in the past to develop digital photographs, especially HDR photography. With certain kinds of HDR photography, you combine multiple images of the same motif, taken with different exposure times, into one image with higher dynamic range than any of the single images. Photoshop recalculates every single pixel of the image for that.
Now, it might be a far out idea, but I was wondering if Photoshop supports any functions to automatically combine two scans of the same image into one of better quality (as opposed to HDR on the one hand, and stitching together scans/photos of different image sections together to a larger panorama with Photomerge on the other hand). That could help remove particles that are not part of the original while preserving small details that are (like film grain in old photographs) and maybe even improve resolution beyond what a scanner can deliver at max res - at least that was my train of thought. Do you know what I mean? Does something like that exist?
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