[Octave-bug-tracker] [bug #33614] Gifs won't return colormap error with imread

[Mike Miller]

Update of bug #33614 (project octave):

                Category:                    None => Libraries              
                  Status:            Works For Me => Confirmed              
                 Release:                   3.4.0 => dev                    
        Operating System:       Microsoft Windows => Any                    

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Follow-up Comment #6:

I can confirm this error on Debian with the development version of Octave. The
attached file opens with Gimp and others so I assume it's a valid GIF format.
Octave opens it with one output argument, but not two.


octave:1> img = imread ("synthgif01.gif");
warning: your version of GraphicsMagick limits images to 8 bits per pixel
octave:2> size (img)
ans =

   100   100

octave:3> [img map] = imread ("synthgif01.gif");
error: imread: invalid image file: __magick_read__: unsupported indexed image
type
error: called from:
error:   /home/mike/src/octave/build-default/../default/scripts/image/imread.m
at line 74, column 7


The error has nothing to do with the additional arguments, none of which are
listed in the help for imread.

GraphicsMagick returns the following for the attached file: classType is
PseudoClass, colorMapSize is 16, computed depth is 2, and image type is
GrayscaleType. Magick::GrayscaleType is indeed not in the case statement in
read_indexed_images.

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