[Octave-bug-tracker] [bug #46529] wrong data when printing to PDF, EPS or PS

[Andreas Stahel]

URL:
  <http://savannah.gnu.org/bugs/?46529>

                 Summary: wrong data when printing to PDF, EPS or PS
                 Project: GNU Octave
            Submitted by: sha1
            Submitted on: Wed 25 Nov 2015 02:51:23 PM CET
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: Andreas Stahel
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

Dear developers

When the figure below is shown on screen it is correct, when printing to
*.pdf, *.eps or *.ps the noise level is to high.

Problem only shows when using a large data set.

If there is no initial noise, there is no problem.

Problem does show with graphics_toolkit qt and fltk,
it does not show with gnuplot.

The problems shows on two different Linux hosts, with versions 4.0.0 and the
developer version of Octave.



graphics_toolkit
% test PDF generation, qt and fltk produce wrong result, gnuplot is OK
t = linspace(0,1.2,100);  % no problem in PDF
t = linspace(0,1.2,2^13); % problem in PDF
y = min(1,50*exp(-10*t));
noise = 0.001*randn(size(t)); % no noise, no problem
y = y + noise;
MaximalAmplitude = max(y)

plot(t,y)
print -dpdfwrite TestPDF.pdf
print -depsc TestPDF.eps
print -dps TestPDF.ps






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