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Finally, with lots of help on the Internet, including the suggestion by @StarGeek, I got it to work. The required tools are: ExifTool ImageMagick You also need a photo taken with the camera, here: R0000349.JPG For testing, if you don't have an existing image, create one (can be any aspect ratio): convert -size 2000x1000 radial-gradient:red-blue TEST.JPG ...


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