I use different tools, but what I do is insert image outputs inline with the calling code, in an Emacs text buffer. (emacs-gtk has native support for this). I d

I use different tools, but what I do is insert image outputs inline with the calling code, in an Emacs text buffer. (emacs-gtk has native support for this). I don't have any explicit "notebook cell" logic. What I do is heuristically assume that an image object immediately following a code block is its corresponding output, and overwrite it on reevaluation. Very inexpensive hack that almost always does the right thing. (Also, the image-invoking functions are just native functions in the source language, so I get a lot of orthogonality for free. For example, all the eval- and send-expr- style keybindings work automagically -- no need to extend the elisp language mode to special-case images).