Created attachment 6756 [details] badly displayed door frame The attached pdf is badly displayed. If you look at the right-hand car, and specifically the door-frame vertical line just behind the front wheel, you will see that the vertical frame line is displayed as a series of segments. If I use, for example, Foxit reader, I can see the door frame as one continuous line.
Other than 'Windows Vista' you don't mention any gs parameters. On my Windows 7 64-bit laptop, I see some of the effect described along the door frame edge, virtually identical to Adobe Acrobat 9 when 'smooth images' is NOT checked. By default, Ghostscript does not smooth images. You can emulate Adobe with 'Smooth Images' checked, or Foxit, by specifying -dNOINTERPOLATE to force image interpolation. Closing since this is the expected behavior.
I use the default parameters: "C:\Program Files\Ghostscript\gs9.00\bin\gswin32.exe" "-IC:\Program Files\Ghostscript\gs9.00\lib;C:\Program Files\Ghostscript\fonts" -dNOINTERPOLATE But even with -dNOINTERPOLATE the door frame is still displayed in segments, which seems to say that the display wasn't smoothed (or not smoothed enough).
I am sorry. I made a typo. The parameter is -dDOINTERPLOTATE
It's rather -dDOINTERPOLATE, and it works!