Groups > comp.graphics.apps.gnuplot > #671

Re: Gnuplot 4.4.3 Palette error

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From	sfeam <sfeam@users.sourceforge.net>
Newsgroups	comp.graphics.apps.gnuplot
Subject	Re: Gnuplot 4.4.3 Palette error
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Date	Sun, 06 Nov 2011 20:00:58 -0800
Organization	gnuplot development team
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Vasilis wrote:

> On Nov 4, 11:57 pm, sfeam <sf...@users.sourceforge.net> wrote:
>> Vasilis wrote:
>> > I am using the x11 where is visible a mixup of the palette
>> > However with the wxt the palette is Ok
>>
>> I can't see any difference between 4.4.2 and 4.4.3 using x11 either.
>>
>> Is it possible that when you installed 4.4.3, an older version of
>> gnuplot_x11 was left on your system?  Having a mis-match in versions
>> between gnuplot and gnuplot_x11 might cause a problem.
> 
> The problem appeared once I've upgraded to Ubuntu 11.10
> when started it reports
>         G N U P L O T
>         Version 4.4 patchlevel 3
>         last modified March 2011
> 
> You can see the images:
> http://pceet075.cern.ch/bnv/gnuplot-wxt.png
> http://pceet075.cern.ch/bnv/gnuplot-x11.png

OK, I see the error and can reproduce it in 4.4.3.
I don't know exactly what causes it, but the good news is that whatever
the cause is, the bad behaviour is not present in the current CVS source
for either version 4.4 or 4.5.   That means version 4.4.4, to be 
released probably next week, will not have this problem.

FWIW I am guessing that the change listed here fixed the problem,
although it's not immediately clear why it would be relevant:

2011-06-17
      * src/getcolor.c (quantize_gray)): Remove a possible discontinuity
      at the boundary of defined palettes with a small number of segments.
      Bug #3317746

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Re: Gnuplot 4.4.3 Palette error Vasilis <vvlachoudis@gmail.com> - 2011-11-06 10:28 -0800
  Re: Gnuplot 4.4.3 Palette error sfeam <sfeam@users.sourceforge.net> - 2011-11-06 20:00 -0800

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