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

[Hartmut]

Follow-up Comment #4, patch #8709 (project octave):

Sorry for the confusion about the default and stable releases.

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]. I.e. this command should
work (and did work before the introduction of
colorspace_conversion_input_check.m):

rgb2ntsc([0.8 0.5 0.3])


This feature is very useful when you just want to know the color values of one
single color in a different color space. Matlab also supports this, and the
new color conversion functions (ment to go into the image package with patch
#8713) support this usage as well.

For a list of the intended changes by my patch, please also have a look at the
closed bug report #45456 .

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