Follow-up Comment #13, bug #66114 (group groff): This may be one of those problems for which there may not be a 100% solution, and its a question of whether a less than 100% solution is worth it. You may want to look at the program pdfdiff. If we had a "gold standard" pdf of what the page should look like, it could be diffed by make test against the new version.
When I have investigated this before I found problems, many minute pixel
differences were shown when comparing text in the same document produced with
the same version of groff run on different systems. I put this down to
different ghostscript versions or different urw-font versions, since the -Z
output on both systems was identical. It would be possible to use it for
detecting missing images from a document, there would be whole missing squares
of pixels where the image should be!!
It may also help to use a reduced dpi for ghostscript to use when converting
the pdfs to a bit map format, then very minor differences in the text may not
register. It may even be possible to roll our own pdfdiff using the pnm/pam
utilities.
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