On Wed, Sep 28, 2011 at 6:26 PM, Carl Magnuson <magnu213@umn.edu> wrote:
I tried converting my PDF map to a JPG using Ghostscript yesterday. It seemed to convert properly, though I saw a handful of warnings that there was an "Unknown operator: 'pop'" in the source PDF. Is Therion producing something which isn't to spec, or producing a newer version PDF that Ghostscript isn't prepared for? I was using Therion 5.3
PDFs should conform the specification, but they are quite complex and as therion constructs them using low-level PDF commands and there is a custom EPS to PDF conversion, there is a possibility for some errors. Therion output is usually tested in Adobe Reader, which is quite sensitive to problematic PDF files. I tried to convert some complex maps to JPG format using GS 8.71 and did not get any warnings. Could you post some problematic file? Martin