I found a web page that describes the Exif file format. This is the format her Sony CyberShot camera saved the images in. So, I have the capability of reading the raw data (I made an image of the partition using hdiutil) using HexEditor or through a small program and saving the found images back to disk.

But even better! Someone had already written a really simple application to do that, with additional support for special devices. Exif Untrasher did exactly what I would have had to do. There are lots of commercial programs that do exactly this, and can cost a decent amount. But the solution is so simple, I'm surprised no one has made their source code available. I may do that at some later point.

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