[Octave-bug-tracker] [bug #45565] Using imwrite to write an 8-bit image to BMP creates a 24-bit image

[Ian Journeaux]

Follow-up Comment #21, bug #45565 (project octave):

Carne
I was able to compile up Octave 4.1.0+ (MXE) so I could test the fix on my
system.

This seems to work as it should, creating an 8-bit BMP file.

octave> img = uint8 (ones (100, 1) .* [0:255]); 
octave> map = gray(256); 
octave> imwrite (img, map, "foo-octave.bmp"); 

If I understand Matlab (maybe I am misinterpreting Matlab)
 
octave> img = uint8 (ones (100, 1) .* [0:255]); 
octave> imwrite (img, "foo-octave.bmp"); 

should also work but, with Octave, still produces a 24-bit image.

I can see the changes to imwrite from this bug fix so I should have a good
compile of Octave but this is a fresh compile so maybe there is a problem with
the compilation.

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