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[Octave-bug-tracker] [bug #45881] Diagonal lines visible in PNG image cr


From: Oliver Heimlich
Subject: [Octave-bug-tracker] [bug #45881] Diagonal lines visible in PNG image created using pcolor
Date: Sun, 06 Sep 2015 09:36:02 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0 Iceweasel/38.2.1

Follow-up Comment #4, bug #45881 (project octave):

If you only want a rasterized version of the image, I must agree that using
the current export functionality, which is based on vecorized intermediate
results, is not ideal.

Direct rendering is possible with the internal function __osmesa_print__ (in
Octave >= 4.0.0), which basically makes a “screenshot” of the OpenGL
scene. Note that the image must be invisible for that purpose and the function
is known to crash on NVIDIA chipsets.

The interval package contains a simple wrapper function __print_mesa__ that
you could use. It adds anti-aliasing to the image and respects the figure's
papersize for export. I use it instead of “print” to export raster
graphics for the interval package's manual, because the described problem gets
even worse in 3D rendering, see bug #45137.

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Reply to this item at:

  <http://savannah.gnu.org/bugs/?45881>

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