[gs-bugs] [Bug 691914] gs 9 is 10 X slower than gs 8.71 with DEVICE=epswrite

bugzilla-daemon at ghostscript.com bugzilla-daemon at ghostscript.com
Fri Jan 28 10:16:10 UTC 2011


http://bugs.ghostscript.com/show_bug.cgi?id=691914

--- Comment #2 from Ken Sharp <ken.sharp at artifex.com> 2011-01-28 10:16:07 UTC ---
(In reply to comment #0)

> I have some tests with a representative PDF file.  The file is black and white,
> so I think that the ICC changes shouldn't be an issue.

In fact this does look like it *is* something to do with ICC profiles. Although
the content of the PDF may appear to be monochrome, there is no monochrome
colour space, so the content must be defined in DeviceGray. The ICC code covers
*all* colours, even gray.

The issue seems to be some form of complexity problem. Not only is the
performance degraded, but the output file size is considerably bigger. I
haven't yet had a chance to check on why this is so.

If you only want PostScript output I would suggest using ps2write instead for
now.

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