https://bugzilla.wikimedia.org/show_bug.cgi?id=36580
Mark A. Hershberger <m...@everybody.org> changed:
What |Removed |Added
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CC| |m...@everybody.org
--- Comment #2 from Mark A. Hershberger <m...@everybody.org> 2012-05-07
14:22:48 UTC ---
>From #ghostscript:
<Robin_Watts> hexmode: What are you using to do thumbnailing ? [09:57]
<hexmode> Robin_Watts: gs
<Robin_Watts> hexmode: What version of gs ? [09:58]
<Robin_Watts> Versions of gs prior to 9.00 will not have handled color
profiles correctly, which means you may see slight colour
shifts. [09:59]
<hexmode> Robin_Watts: I'll double check but the cluster runs Ubuntu Lucid by
default: http://packages.ubuntu.com/lucid/ghostscript
<hexmode> ah, that is prior to 9.00
<hexmode> :)
<hexmode> I'll add that to the bug
<hexmode> and ask ops to upgrade
<Robin_Watts> BUT... I'd consider using mupdf rather than gs.
<Robin_Watts> MuPDF does not handle color profiles either, but for PDF files
with text in, the antialiasing given is MUCH nicer (and faster).
[10:00]
<Robin_Watts> gs is by far the better choice when running for print output.
[10:01]
<Robin_Watts> mupdf is optimised for screen output, so may be a better bet for
what you need. [10:02]
<hexmode> I wasn't aware of MuPDF [10:03]
<Robin_Watts> Also, it would be good to see the exact command used by the
wikimedia cluster, because the options used can have a large
effect.
<Robin_Watts> muPDF is from the same company that maintains gs, and is
released under the same license.
<Robin_Watts> That looks a lot like you're rendering to JPEG - the ringing
artifacts etc. [10:04]
<chrisl> It is a jpeg. [10:09]
<chrisl> hexmode: if you are stuck with the GS 8.x (I think in Lucid) you can
try using the -dUseCIEColor command line option. [10:11]
<hexmode> chrisl: that's probably the best shot at this point. tyvm [10:12]
<chrisl> hexmode: the "heavily compressed" effect is, as Robin_Watts
mentioned, because it's jpeg compressed - the solution is: don't use
jpeg..... [10:13]
<hexmode> chrisl: yeah, don't know why they didn't use png
<chrisl> png would be my choice, yes [10:14]
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