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Re:A dumb reason computer vision apps aren’t working: Exif O... by mceachen on Thursday October 10, 2019 @01:33AM (#21211244)
Make sure you rtfm carefully.

Many years ago I accidentally deleted all the metadata from many images that needed rotating.

Re:A dumb reason computer vision apps aren’t working: Exif O... by acqq on Thursday October 10, 2019 @02:49AM (#21211649)
> -copy comments

> Copy only comment markers. This setting copies comments from the source file but discards any other data that is inessential for image display.

> The default behavior is -copy comments.

Argh! Thanks! So also my "lossless" transformations .. weren't.