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Date: Thu, 28 Sep 2017 06:07:59 -0700 (PDT)
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Subject: pdfcairo/pngcairo file size limitations?
From: schwarz.cd48@gmail.com
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Xref: csiph.com comp.graphics.apps.gnuplot:3758

gnuplot version 5.0 patchlevel 0


Hello gplusers,

I am trying to make a matrix plot of a file that is made up of 48 columns a=
nd 50000 lines. Each column contains integers between 0 - 140. I also want =
to produce a pdf in the end. The script for the plot looks like this

    #!/usr/bin/gnuplot
    set terminal pdfcairo font ",60" size 16,18
    set output "output.pdf"

    set cbrange [0:140]
    plot 'data.file' u 1:2:3 matrix wi image

The problem is that in the output.pdf the plot area/canvas is empty and onl=
y the xtics, ytics, and cbtics are shown. If I open gnuplot in the terminal=
 and just do the plot in the standard qt terminal I will see the plot norma=
lly as expected, but it won't be produced in the pdf. The same goes for the=
 pngcairo terminal. On the other hand, if I use=20

    set terminal postscript eps enhanced

then the output.eps will contain the plot with no problems and I can conver=
t eps to pdf.

But why does the pdfcairo/pngcairo not work?

I also found that if I reduce the number of lines in my 'data.file' from 50=
000 to 30000 (cutting off 2/5 of my data), then I will get a normal plot in=
 my output.pdf. If I increase it again to 40000, the canvas will again be e=
mpty again. Does pdfcairo have some limitations here?

Cheers,
Paul