[Octave-bug-tracker] [bug #53073] OpenGL color LUT seems incorrect after a print() for the Qt graphics toolkit

[Dan Sebald]

Follow-up Comment #3, bug #53073 (project octave):

LUT means "look-up-table".  It's analogous to the colormap() of Octave but
it's at the graphics hardware level.  The graphics memory is passed through a
LUT to generate the signal levels to display on the color monitor.  Type
"graphics LUT" in an Internet search engine and a lot of graphics card info
will turn up.  Back in the early days of linux and computer OS's, there would
be all sorts of strange color issues when, say, one window would go out of
focus--having to do with immature drivers, limited graphics memory, etc.  My
point is that the reported bug isn't something to do with Octave figure
redrawing, it has to do with some low-level setup of OpenGL...as though the
on-screen OpenGL is acquiring the off-screen's LUT until that memory area
associated with the plot window is refreshed.

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