From time to time when reviewing questions I stumble upon posts that are terribly formatted. Here is a good recent example (note the screenshot with almost invisible text): transformation retransformation von Estimates
Poorly formatted questions usually use screenshots where text would be better, or they just paste some formulas or tables without formatting, etc.
My question is - what are reviewers expected to do in such situations? Should I downvote, leave a comment about formatting, vote to close, or try to transcribe the text from the screenshot (some nice souls do this, but ...)?