Bruno,
To be honest, I don't know what differs between the two tools, as they
both come from Cairo, I assumed that pdftops was just a small wrapper
around the same code as pdftocairo but with the options pre-set for PS
output.
I'm a Ghostscript developer, so I can't really answer specifics about
The problem, I suspect, is the way Cairo rights PDF files (the gmap.pdf
file you attached above was created by Cairo). The Cairo *always* writes
the page contents into one or more PDF transparency groups - even when
all the contents are really opaque.
The issue is that, due to the way PDF works
It seems that the fix for this was:
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=8031fd57
For me (using git cherry-pick) the patch applies cleanly to the 9.05
sources.
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