[gs-bugs] [Bug 690181] GS creates large PDF's compared to Destiller.

[bugs.ghostscript.com-bugzilla-daemon at ghostscript.com]

http://bugs.ghostscript.com/show_bug.cgi?id=690181





------- Additional Comments From ken.sharp at artifex.com  2008-11-24 05:39 -------
Hmm... You say that the output PDFs are larger if the original document
contained TIFF data (ie images).

The most likely reason for GS output being larger than Acrobat Distiller, in
this case, is that Distiller is down sampling the images to a lower resolution.
You don't say what Distiller settings you are comparing with, nor what your
command line to Ghostscript is, so I can't be definite.

Ghostscript is also capable of downsampling images to a lower resolution if
desired, using the following distiller params:

ColorImageDownsampleThreshold
ColorImageDownsampleType
GrayImageDownsampleThreshold
GrayImageDownsampleType
MonoImageDownsampleThreshold
MonoImageDownsampleType

See gs/doc/ps2pdf.htm. See also these distiller params:
ColorImageDict
ColorImageFilter
GrayImageDict
GrayImageFilter
MonoImageDict
MonoImageFilter

which control the kind of compression applied to image data in the output PDF file.

It is still possible that there's a problem (though if the output is correct I'd
be inclined to say this would be an enhancement, not a bug). If you would like
us to investigate further we will need a sample PostScript or PDF file (not
Visio file !) file, the GS command line you are using, and the Distiller
settings used to create the file you are comparing with.

If you upload a sample file you can mark it as private afterwards preventing
non-Artifex access to the file.




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