Poppler cairo backend doesn't render PDF with lots of thin lines properly
I originally reported it to inkscape but it also happens with evince and it seems to be an issue with some viewers. For example, gsx (ghostscript viewer), okular and google-chrome PDF reader show the PDF correctly, while evince, firefox and some others don't. https://gitlab.com/inkscape/inbox/-/issues/3342
The issue is seen when comparing the original eps file with the transformed pdf... it is the same if it is converted with ps2pdf or plain gs command. The PDF is seen like a bit "pale" because some thin lines are dropped
I reported it to evince upstream and they found that the issue is in poppler cairo backend: https://gitlab.gnome.org/GNOME/evince/-/issues/1472#note_892217