I needed to advise eshell/cat (as per https://emacs.stackexchange.com/questions/3432/display-images-in-eshell-with-iimage-mode https://emacs.stackexchange.com/q

I needed to advise eshell/cat (as per https://emacs.stackexchange.com/questions/3432/display-images-in-eshell-with-iimage-mode https://emacs.stackexchange.com/questions/3432/display-image... ) before I could get this to work.