>> gs 9.00 on GNU/Linux, using gv 3.7.0.
>> [...]
>> Looks like a bug in the anti-aliasing device of gs: If I switch to
>> B/W, the ledger line is just fine.
> 
> Are you reporting this to the ghostscript folks?

I haven't had time yet to install the latest GS version (9.05).  Any
takers?

> Any idea for a workaround? I urgently need to generate the png files
> (~50 examples) before the weekend to insert them into a thesis (.doc
> file) and send the draft to the advisor.
> Using -dpixmap-format=pngmono creates ugly pixelated images,
> everything else (even inserting the eps file into libreoffice)
> creates those white rectangles inside the ledger lines.

Just create PDFs, move them into a separate directory and do

  for i in *.pdf; do
    cat $i.pdf | pdftoppm | pnmtopng > `basename $i .pdf`.pgn
  done

I'm using pdftoppm 0.18.3 (from poppler).


     Werner

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