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

[Dan Sebald]

Follow-up Comment #11, bug #52599 (project octave):

Can you give an example and some screen shots?  Include a screenshot of FLTK
result for the same commands if possible, for comparison.  For example, 


octave:1> colormap(hot)
octave:2> image(triu(ones(256))'*triu(ones(256)))
[screen capture here]
octave:3> colormap(hot(256))
[screen capture here]


See attached PNG examples, for development version and gnuplot 5.3 patchlevel
0.

The gnuplot change was in version 5.2 (from NEWS):


New features introduced to 5.2 in patchlevel releases
=====================================================
[snip]
* NEW command "set rgbmax <value>" controls interpretation of input RGB
values


and it would be a simple matter to put a conditional statement in place to
determine if


-    retval = 1 + cdata * (cmap_sz-1)/255;


scaling should be done, but I want to make sure to understand what exactly the
scaling problem is.

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