[Octave-patch-tracker] [patch #8709] fixes to color conversion functions (mainly rgb2ntsc and ntsc2rgb)

[Carnë Draug]

Follow-up Comment #5, patch #8709 (project octave):

> The purpose of the cited part of my patch is to allow for color conversion
of "single pixel images", having size [1 3] or [1 3].

None of those is a single pixel image (a single pixel image would be of size
[1 1 3]).

[1 3] is a single color colormap so it gets treated like one. It would also
not go into that path because of the "if (! iscolormap (in_arg))" above. This
already works, on stable and default branches.

Something of size [3 1] seems like wrong input. Checked on Matlab R2010b and
it doesn't support it. I don't we think we should either.

I have pushed two more csets related to this patch:

http://hg.savannah.gnu.org/hgweb/octave/rev/175aed5acb85

http://hg.savannah.gnu.org/hgweb/octave/rev/bc51aa0d604a

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