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[Octave-bug-tracker] [bug #45494] Patches have spurious (antialising) li

From: Pantxo Diribarne
Subject: [Octave-bug-tracker] [bug #45494] Patches have spurious (antialising) lines in vector printout
Date: Mon, 17 Jul 2017 16:39:34 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:53.0) Gecko/20100101 Firefox/53.0

Follow-up Comment #15, bug #45494 (project octave):

@jwe: actually I do see antialising lines in the eps from comment  #12 when I
use either evince or Okular so xpdf/poppler version or  graphics hardware may
also play a role. The best result I have seen for eps files and 3D surfaces
were obtained when I tried to remove the "GL2PS_NO_PS3_SHADING" option in
gl2ps-print.cc. The drawback is that ghostscript is unable to convert those
postscript level 3 files so we are back at the beginning.

@Dmitri:As for the reason for not using the native gl2ps pdf output, I think
the idea was to avoid having to fight format specific bugs. Actually the
native pdf output is often nicer (it is easy to test it using the -dpdflatex
devices) but it has bugs that the postscript doesn't have (and vice versa),
see e.g. lit surfaces:

clf ();
peaks ();
shading interp
cd /tmp
print -dpdfwrite converted.pdf
print -dpdflatexstandalone native
system ("pdflatex native")
open native.pdf
open converted.pdf

Note that if you remove the light in this example then "native.pdf" is much
nicer than "converted.pdf".


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