[Octave-bug-tracker] [bug #41673] imwrite creates bad jpeg grayscale images

[Carnë Draug]

Update of bug #41673 (project octave):

                  Status:                   Fixed => Patch Submitted        
             Open/Closed:                  Closed => Open                   

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Follow-up Comment #6:

I just gave it a go on the default branch and despite comment #2, this is
indeed not fixed.

Answering comment #4

yes it is a wonder because this works fine for other formats. I can't find it
on the documentation at the moment but if I remember correctly (it has been
almost 2 years), you should be able to create grayscale images by setting the
red channel.  And that is why 10 lines above the snippet you show, the image
is created with type Magick::GrayscaleType 

What is happening then? Is the mean of the 3 channels being used on the new
image? Why does this not happen for the other coders/formats?

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