Hi, In org-display-inline-image--width we have the restriction that percentages and floating point width specifications must be between 0 and 200% (or 0.0 and 2.0) of the text area. Reading the comments, it sounds like this is done because you might specify something like 1.2\linewidth, but you wouldn't write something like 5.0\linewidth. I guess that's fair, but I can't say with certainty that there is never any valid reason to, e.g., specify that you want a width of 500% of the text area. I'm also not sure that we should prevent people from using 5.0\linewidth, even if it is a bit odd. The intent is clear.
Maybe I'm missing a reason as to why this is done? Best Matt