Actually, one follow-up question - which I realise might be asking too much!
Some of the books I have contain literally hundreds of images, some of which are already in jpg form, distributed apparently randomly throughout.
This makes it very difficult to select just the non-jpg images, other than manually. If I accidentally include just one jpg image when I'm trying to change the file extensions in bulk, it gives me an error message because, in that one case, I'm making a request that is circular. So, is there a way to sort the images in the left-hand panel by type, rather than in terms of their position in the book? Then it would be relatively easy to select just the non-jpg images.
Thanks again!
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