I have been using NetSurf to save PNG images from Google Books. Most
of these are pages of text of varying size, which as far as I can tell
is the only difference (apart from content). Some of these display
OK in DPScan v1.24 on RO 4.29, but others crash with "...internal
error type = 2", all display OK (of course) in NetSurf (28 Dec 2007).
This means that, with those that crash, I can't do anything with them
apart from copy using the filer.