Using gnuplot, how do you create an eps file of a contour plot?

Question

Using gnuplot 5.0 patchlevel 5, I am trying to create an eps file containing a contour plot. However, the contour lines are accompanied by a grid and do not have the requested color. The output using the png terminal is just fine.

Here is the minimum code I use to generate the eps image:

set terminal epscairo
set output "test.eps"
set pm3d map impl
set style increment user
set contour
do for [i=1:5] { set style line i lc rgb "black" lw 3}
splot "data.dat" w pm3d notitle

eps image created by gnuplot with the funny feature around the contour

replacing the epscairo terminal by png gives the desired output:

png image created by gnuplot, this how I would like the eps image to look like

The data file I am using can be found here: data.dat

See stackoverflow.com/a/18954245/2604213 for a detailed explanation of this problem — Christoph
– Christoph, Commented Sep 19, 2018 at 20:38
I don't think that I have this type of problem. What I see in the eps figure is just an additional grid and change of color of the contour lines, no moiré. — Daniel Förster
– Daniel Förster, Commented Sep 20, 2018 at 9:44

Gavin Portwood · Accepted Answer · 2018-09-19 16:57:34Z

1

I'd recommend using the epslatex or postscript terminals so you can encode the heat map as a binary in png (see the level3 option for both terminals).

Try replacing your first line with the following:

set term postscript color eps level3

answered Sep 19, 2018 at 16:57

Gavin Portwood

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2 Comments

Christoph Over a year ago

That option affects only plotting with image, but not pm3d.

Daniel Förster Over a year ago

Thank you, that fixed the problem.

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