writing jpg files.

[Laurent Hoeltgen]

Hi,

I believe I have encountered this bug:

http://octave.1599824.n4.nabble.com/Octave-3-8-0-imread-and-imwrite-td4662155.html

Since I couldn't find the solution, I'm asking again.

The following code results in 2 different images.

I = [0, 1 ; 1 0];
imwrite (I, 'wrong.jpg', 'Quality', 100)
imwrite (I, 'good.png')

The jpg image is badly scaled. The pixel values are too dark. The png file is 
correct. In addition I get the following warning:

warning: your version of GraphicsMagick limits images to 8 bits per pixel

when the images are written.

I have the same issues with other images that I write to jpg. Does anybody 
have an idea what is causing this?

I'm running octave 3.8.1, GraphicsMagick 1.3.18 2013-03-10 Q8 on the latest 
Linux Mint release.

Regards,
Laurent