In article , Carlos E.R.
wrote:

On 17/07/2020 23.21, dale wrote:
What about a tag in an image file indicating it is not the original?

And how would you mandate it being obeyed?

the bigger problem is preventing its removal.

the correct way to indicate an image original and never modified is to
cryptographically sign it, which is what some cameras do.

Taking it further, what about including each edited image in the file?

making the file huge.

only if done incorrectly.

However, that's an history file. The Gimp saves images that way, undo works.

saving the undo history in the image is silly. is that gimp's lame
attempt at non-destructive editing because they refuse to do it
correctly? if so, that's laughable.