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Oh God... it's worse than I thought... no wonder it didn't work.
- image/tiff
- image/svg+xml
- image/x-ms-bmp
- image/x-portable-pixmap
- image/x-nikon-nef
- image/x-matroska
That last one sounds like it's a video not an image... most are unsupported by anything, and some are custom.
This is 15 out of the last 50 attachments... but there are some PDFs and other things in there and it doesn't mean a third of images based on the most recent sample.
It just means it's not garbage per se... it's just unsupported by a library that focuses on a tiny number of most common image types.
- image/tiff
That does indeed sound complicated and not worth the effort!
If you can share a couple of examples of image attachments that couldn't have their dimensions parsed, I can run some tests to see if there's anything else going on if you'd like?