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MathGroup Archive 2001

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Re: RGBColor to Hue?

  • To: mathgroup at
  • Subject: [mg31049] Re: RGBColor to Hue?
  • From: Jens-Peer Kuska <kuska at>
  • Date: Sat, 6 Oct 2001 03:32:14 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <9pecgj$sin$>
  • Sender: owner-wri-mathgroup at


no documented function ? really ? And what's that:


"ToColor[color, form] converts color to form if form is GrayLevel,
RGBColor \
or CMYKColor color is converted into it. Otherwise form[color] is
evaluated \
and the result is expected to be a valid color directive."


David Park wrote:
> Dear MathGroup,
> Does anyone know transformation equations that will convert RGBColors to
> Hues? If one looks at the input ColorSelector there seems to be an
> equivalence between them. Yet there seems to be no documented function which
> converts from RGBColor to Hue.
> Specifically I would like to obtain a hue and a brightness for any RGBColor.
> I am not looking for something picture perfect. Just something roughly
> equivalent for screen display of Mathematica notebooks.
> David Park
> djmp at

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