More often than I'd like, I see screenshots of terminal emulators while browsing through the newest questions and the "First Posts" review queue. If, given the context of the post, it is clear that the screenshot is posted for its textual content rather than its appearance, I generally edit the post to instead contain a transcription of said screenshot.1
After doing so, I tend to leave a comment along the lines of:
Please don't post images of text. I have transcribed the contents for you, but you may want to check for errors in transcription.
I have received thanks from one or two posters for this, and nobody has yet seemed opposed to the practice, but I would like a broader opinion — is image transcription in and of itself a valid reason to edit a post?
1 Often the edit involves grammar fixes and other formatting changes as well, but that is not the point of my question