Re: [Gnuplot-info] How to plot HeatMap by ourselves?

[Thomas S. <t.s...@fz...>]

gnuplot uses the z-value as gray-value and then converts the gray-value
into a color by using a palette.

have a look at
http://www.gnuplot.info/docs/node215.html
or get the gnuplot source code and figure out how the color mapping
is done.


WEI Dong-2 wrote:
> 
> Hello,
> 
> I want to plot some data in my own program, just like using the "set pm3d
> map" statement in gnuplot.
> But I find that it is very complicated to transfer from a double value to
> a RGB triple.
> It is not linear, and not symmetrical among R, G and B.
> 
> Could you tell me the formula?
> 
> Thank you very much!
> 
> WEI Dong
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