"J. P. Gilliver (John)" wrote

| If it loads one that already _has_ the metadata though, and subsequently
| saves it, does it mess it up, as apparently PSP does?

My PSP16 doesn't do that. It gives you an option. Maybe
you're not noticing the save options?

PSP5 loses the data because it creates a new header, using
only the necessary parts, and doesn't see the EXIF data. Any
program that doesn't see it will drop it out. It's not necessary
for reading the file. There are specific file markers that ID things
like the beginning of image data. The optional parts of the header
don't relate to that. They're only there if you look for them.