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

[Mike Miller]

Update of bug #40669 (project octave):

                Severity:              3 - Normal => 4 - Important          
              Item Group:                    None => Incorrect Result       
                  Status:                    None => Confirmed              

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Follow-up Comment #1:

Confirmed. I also don't have the gm executable on my system. But apparently
"make check" doesn't exercise this code path because I haven't seen an error
yet.

Yes it would be much preferable to reimplement with magick library calls,
could be added to __magick_read__.cc. Otherwise this adds an extra runtime
dependency that our distributors need to know about, and this is fairly
hidden.

If we have to keep the current approach, it at least needs a runtime check for
the executable and an appropriate error message if "gm" is not found in PATH.
It also doesn't look to me like the temporary files being created are deleted
at all.

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