Dear friends, I forward this from the poppler team.
Amigos, os reenvĂ­o esto que me llega del equipo de Poppler.
---------- Mensaje reenviado ----------
De: "evince" <bugzi...@gnome.org>
Fecha: 20/08/2011 12:22
Asunto: [Bug 503290] too thick barlines from GNU LilyPond PDF
Para: <francisco.v...@hispalinux.es>

https://bugzilla.gnome.org/show_bug.cgi?id=503290
 evince | printing | 2.20.x

Adrian Johnson <ajohnson> changed:

          What    |Removed                     |Added
----------------------------------------------------------------------------
                CC|                            |ajohn...@redneon.com

--- Comment #9 from Adrian Johnson <ajohn...@redneon.com> 2011-08-20
10:22:19 UTC ---
The problem has been fixed in poppler git. It was caused by stroking a zero
width line. This is supposed to draw the thinnest line possible on the
output
device. As cairo does not support 0 width lines, poppler was setting the
line
width of a 0 width line to 1 unit. This is correct for the screen where 1
unit
== 1 pixel is the thinnest line. But when printing 1 unit == 1/72" which is
too
thick.

I'm not sure why LilyPond wants to fill a rectangle then stroke a 0 width
line
around it. The second step seems to be redundant. The PDF Reference says
that 0
width lines should not be used because the result is device dependent.

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