[Octave-bug-tracker] [bug #40669] rgb2ind: uses system ("gm convert....") for dither option

[Carnë Draug]

Follow-up Comment #4, bug #40669 (project octave):

As I mentioned, the missing options should not be very difficult to implement
but I won't have the time to do it. If anyone wants to do this, it's basically
finding the closest value in the colormap, and then distribute the difference
(error) to the pixels ahead. To note that different algorithms exist, the only
difference being how the error is distributed so a very interesting thing
would be to have the internal function accept some sort of mask specifying how
to perform the distribution.

Anyway, for the upcoming release, my opinion would be to revert those changes
and not implement this options (unless someone picks up this and implements it
on time).

Note that if we keep the current implementation, when we implement this again
properly with Matlab compatibility, the results will be different.

I'm adding Adam H Aitkenhead to the mailing list of this bug since he was the
author of the change and of bug #40664.

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