[gs-bugs] [Bug 689881] PDF generated by GS renders in lighter shades

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

http://bugs.ghostscript.com/show_bug.cgi?id=689881

ken.sharp at artifex.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |WONTFIX



------- Additional Comments From ken.sharp at artifex.com  2008-12-15 03:49 -------
The reason for the scaling factor is because pdfwrite uses a default resolution
of 720 dpi. This allows for better accuracy under some circumstances. However,
because the page is very large, the default resolution would result in numbers
outside the acceptable range for Acrobat. So a compromise resolution is set
instead (in this case ~313 dpi).

I don't want to change this behaviour, as I believe it would interfere with
other heuristics intended to produce file which work on the largest possible
range of versions of Acrobat.

You can, however, achieve the result you want by modifying the resolution
yourselves. If you use the -r command line switch and set the resolution to 72
dpi you will get the same result as is produced form Acrobat Distiller. Well,
from recent versions anyway. For some reason the file you attached, produced by
Distiller 4.05, seems to use a resolution of ~96 dpi. Recent versions seem to
use 72 dpi.

Eg:

gs -r72 -sDEVICE=pdfwrite -sOutputFile=./psuser.pdf ./psuser.ps

produces a file which for me looks identical with the product of Distiller 7
when viewed in Adobe Acrobat 7 at all zoom factors.






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