[Octave-bug-tracker] [bug #45779] Writing 8-bit grayscale image to bmp file should write an indexed image

[Ian Journeaux]

Follow-up Comment #8, bug #45779 (project octave):

I see two reasons to implement this change

1. Matlab compatibility. Whether it is explicitly stated in the documentation
or not, given a uint8 array, Matlab writes a 8-bit-per-sample indexed
grayscale image. Specifying the map might be more precise but this is a place
where Matlab compatibilty would be valuable.
2. Within Octave, if you write a uint8 array using imwrite, and read the array
back in, it comes back in as an 3 channel RGB array instead of the original 1
channel array. 


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