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[Octave-bug-tracker] [bug #45881] Diagonal lines visible in PNG image cr


From: anonymous
Subject: [Octave-bug-tracker] [bug #45881] Diagonal lines visible in PNG image created using pcolor
Date: Sat, 05 Sep 2015 16:58:34 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:39.0) Gecko/20100101 Firefox/39.0

URL:
  <http://savannah.gnu.org/bugs/?45881>

                 Summary: Diagonal lines visible in PNG image created using
pcolor
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sat 05 Sep 2015 04:58:33 PM UTC
                Category: Plotting with OpenGL
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.1
        Operating System: GNU/Linux

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Details:


h=pcolor(rand(16));
set(h,'EdgeColor','none');
colormap(gray(256));
print('test.png','-dpng','-r600');


Actually, you do not need to set colormap, but it makes the issue more
visible.

Since I need to get rid of them quickly I also ask for a different solution. I
use pcolor since I want logarithmic x- and y-axis. I can apply a median filter
afterwards, but that requires horrible amount of RAM since my grid is
fine-grained. Since it appears that Octave does it through gs,


gs --version


gives me 9.10



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File Attachments:


-------------------------------------------------------
Date: Sat 05 Sep 2015 04:58:33 PM UTC  Name: test.png  Size: 332kB   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=34816>

    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?45881>

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