The photographic community has done very little to preserve the credibility of the image. My sense is that the photograph is a quotation from appearances. It's supposed to be a recording, if you're using it journalistically. If you're not doing that, the reader needs to know. Just like if you're quoting someone and you put it in quotation marks, that's what they said. If you want to paraphrase, you don't use quotation marks so the reader knows the difference. With a photograph, the reader assumes it's a quotation and if it's not, you have to tell them. If you don't do it, it's illegitimate in terms of journalism. You can manipulate all you want, but just let people know you're doing it.