Since writing the query below, I realise that sometimes 'export' doesn't
export: it produces an (undocumented) result can't open file which seems
inappropriate. I had somehow messed up the file path and hadn't noticed. There
was a different problem with the framing of the image - hard to track
I seem to be going crazy, but I can't see what I'm doing wrong. I have an image
say myImage, and I export it with a command like
export img myImage of cd myCard of stack myStack to URL (binfile:
somePath /someFileName) as JPEG
This works, and the file appears, but it is not the right size: I
