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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: strange palette behavior for postscript terminal
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Date: Wed, 17 Aug 2011 08:49:15 -0700
Organization: gnuplot development team
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Lucie Jilkova wrote:

> Hello,
> 
> i've got a problem with (probably) a palette settings using postscript
> terminal. I'm plotting a 2D map and i want to set a palette so that
> all bins with values equal to 0.0 are mapped by white color, and all
> the other (non-zero) values by some different color.
> 
> I'm using Version 4.4 patchlevel 3 @ System: Linux
> 2.6.30.8-64.fc11.i586. The example minimal script could be as
> following:
> 
> #####
> reset
> set view map
> set palette model RGB defined (0.0 "white", 0.0 "white", 0.0 "blue",
> 1.0 "blue")
> set term  postscript
> set output 'map.eps'
> splot '-' w image
> 0 0 0.0
> 0 1 0.1
> 0 2 0.01
> 1 0 0.001
> 1 1 0.0001
> 1 2 0.001
> 2 0 0.01
> 2 1 0.1
> 2 2 1.0
> e
> unset output
> set term wxt
> reset
> ####
> 
> So there should be one white bin at [0,0] and the rest of bins blue.
> But the output 'map.eps' shows more than one white bin... For wxt or
> pdfcairo terminal the similar script works well. Please, does anybody
> have an idea?

It seems that you really want a 2D plot command and something other
than palette-based coloring.

How about something like

set style data rgbimage
###################### red component ####   green #########   blue
plot '-' using 1:2:( ($3>0) ? 0 : 255 ):( ($3>0) ? 0 : 255):(255)



> 
> Thanks!
> Lucie