I have a ridiculous digital picture frame that stupidly shows embedded thumbnails rather than the actual image if they exist. So I have to open each file in turn in GIMP and re-save them without thumbnails, assuming that this removes all of the thumbnails from the image file. If I could see in the file properties if the file contained an embedded thumbnail, then I could determine which files need to have the thumbnail removed rather than guess. Apparently a JPEG can have various sources of thumbnails (from https://en.wikipedia.org/wiki/JPEG_File_Interchange_Format#Exif.2FPhotoshop_compatibility) 1. Indicated within the JFIF segment. 2. Indicated within the JFIF extension (JFXX) segment. 3. Indicated within the EXIF segment.
Apparently libexif supports thumbnail extraction from the EXIF segment, so that may be a start.
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