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I think the line (while the details may be certainly difficult) is along “are you making the existing image/story clearer or are you changing the narrative of the media?
When the story you get from the image changes, then you’ve crossed the line.
I generally agree with you but that is still a fuzzy line to draw that is likely very dependent on circumstances. The devil is in the details.
I can concede to that… there will be some grey area, but the idea that “there is no true photo” or “there is no truth” feels wrong.