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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Extending plot types - adding a CIE 1931 type diagram
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Date: Wed, 07 Aug 2013 18:51:12 -0700
Organization: gnuplot development team
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hvezdny.cestovatel@gmail.com wrote:

> Hello guys,
> 
> I would like to extends Gnuplot with the ability to generate a CIE1931
> digram of color spectrum, basically looking like this one:
> 
> http://commons.wikimedia.org/wiki/File:CIExy1931.svg
> 
> This kind of generator is already present in netpbm package as ppmcie.
> 
> I would like Gnuplot to be able to provide this background for the
> plot, so one could easily plot curves over this background directly
> with 'plot' command, withou the need of fitting the background to the
> actual plot.
> 
> So the task would be:
> 1. generate the background color image with the right coordinates, so
> that 2. plot points and curves into that plot as usual, taking advance
> of the coordinate system of the CIE x-y diagram

If you already have such an image, it can be mapped onto a specific 
coordinate range of the plot area using the plot style "with rgbimage".
See for example

  http://gnuplot.sourceforge.net/demo_cvs/barchart_art.html


> 
> Thanks in advance for ideas,
> Martin