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[Octave-bug-tracker] [bug #49137] some grayscale images are displayed ba

From: Francesco Potortì
Subject: [Octave-bug-tracker] [bug #49137] some grayscale images are displayed badly
Date: Tue, 20 Sep 2016 12:38:03 +0000 (UTC)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:48.0) Gecko/20100101 Firefox/48.0


                 Summary: some grayscale images are displayed badly
                 Project: GNU Octave
            Submitted by: pot
            Submitted on: Tue 20 Sep 2016 02:38:01 PM CEST
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.3
        Operating System: GNU/Linux



This behaviour is the same with gnuplot and fltk, and happens with the
attached file (which is the reduction of 1980x1980 original which exhibits the
same problem).

> imshow bug.jpg   # bad
> im = imread("bug.jpg");
> imshow(im)       #good
> close all
> subplot(3,2,1)
> image(im)        #bad

The instructions marked as #bad both generate a flat picture with a single
bordeaux colour.

The instruction marked as #good generates the correct picture, in different
levels of grey.

As a workaround, for both #bad cases if I first convert the grey image to RGB
then the display is correct:

im = repmat(im,1,1,3);


File Attachments:

Date: Tue 20 Sep 2016 02:38:01 PM CEST  Name: bug.jpg  Size: 1kB   By: pot



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