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

From: Pantxo Diribarne
Subject: [Octave-bug-tracker] [bug #49137] some grayscale images are displayed badly
Date: Tue, 20 Sep 2016 13:35:58 +0000 (UTC)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0) Gecko/20100101 Firefox/48.0

Update of bug #49137 (project octave):

                  Status:                    None => Confirmed              


Follow-up Comment #1:


I think the very first issue is that the image data we get from GraphicsMagick
(imread) are not the original ones. 
I tried to run "imfinfo" and "imread" in Octave and Matlab (R2016a on linux)
and the main differences are :
* imfinfo: the "ColorType" is "Grayscale" in Octave and "TrueColor" in Matlab
* imread: consequently returns no cmap in both cases but a 19-by-19 matrix in
Octave and a 19-by-19-by-3 Matlab

I think this problem has already been discussed by Carnë extensively (who I
am ccing). AFAIR it boils down to GraphicsMagick does not give access to the
actual original data.

Now a workaround for the first issue ("imshow (filename)") could be to treat
the image as grayscale when imfinfo tels to do so. 


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