I agree with @texnixe – I myself can find ways to fix a corrupted image, but that’s not an option for the client / editor, who thinks he “broke” the CMS. It’s not a big deal for those three images, I can convert them for the client; but it would be great to have a future proof fallback (e.g. an explcit error code “Invalid file” or “unable to process file”) if that happens again.