Hendrik Boom wrote:
I'm looking for a file format for images that plays nicely with revision control. Ideally I'd like to edit them while seeing what I'm editing, whether it's a line drawing (like inkscape) or a pixel map. [snip]
You didn't say much about your actual drawing mixture.You might get some ideas by looking at details of *EARLY* versions of HPGL and PostScript.
A couple of quick links from Google: http://en.wikipedia.org/wiki/HPGL https://www.swiftview.com/pclcorner/pclcorner1.htm I'm drawing on memories circa Win 3.1 and CPM-80 . HTH YMMV ;/