[Octave-bug-tracker] [bug #52599] gnuplot shows shaded images with imshow

[Shane]

Follow-up Comment #12, bug #52599 (project octave):

Sure.  Here is a session:


$ gnuplot --version
gnuplot 5.0 patchlevel 2
$ ./run-octave --no-gui
GNU Octave, version 4.2.2
...
octave:1> graphics_toolkit fltk; figure(); imshow(imread("~/mandrill.png"));
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast
octave:2> graphics_toolkit gnuplot; figure();
imshow(imread("~/mandrill.png"));
octave:3> exit


Screenshot of the figures: https://snag.gy/ljNxYJ.jpg

The file mandrill.png is a standard sample image from here:
http://pngnq.sourceforge.net/pngnqsamples.html

This is with an unpatched Octave built from source on GNU/Linux from the tag
"release-4-2-2".  All other packages are installed from the system
repositories (CentOS 7).

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