Groups > comp.graphics.algorithms > #915

Re: decorative random colors algorithm

From	JohnF <john@please.see.sig.for.email.com>
Newsgroups	comp.graphics.algorithms
Subject	Re: decorative random colors algorithm
Date	2012-07-04 05:15 +0000
Organization	PANIX Public Access Internet and UNIX, NYC
Message-ID	<jt0jh7$ra1$1@reader1.panix.com> (permalink)
References	<jspf0f$moq$1@reader1.panix.com> <f84b94d7-c08c-4469-8a9f-346ced4e16f6@googlegroups.com>

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gernot.hoffmann@hs-emden-leer.de wrote:
> John,
> 
> I've added a HLS-page to the doc:
> http://www.fho-emden.de/~hoffmann/swatch22112002.pdf
> 
> It shows RGB-color in HLS coordinates. One graphic per Hue
> 0 to 330 step 30. Horizontally the Saturation and vertically
> the Lightness. These are cylinder coordinates.
> In order to get the double cone appearance, it would be necessary
> to distort the lower half and the upper half linearly so that
> the lines L=0 and L=1 shrink to points.
> The purpose is not to show the double cone, but simply the colors
> which belong to each parameter set H,L,S.
> 
> Best regards --Gernot Hoffmann

Thanks, that's nice. After seeing some of those pages, I'm going
to add a "rainbow" ("random" with an "i", and with the d<-->b
reflected about a vertical axis, and the m<-->w about a horizontal
one:) option, so that a sequence of lines will each start with a
fixed h,l,s at one endpoint, and then vary 0<h<360 at the other
endpoint. So each design will consist of several (the number of its
polygon sides) such rainbow fans. That'll take a while to get to.
   Meanwhile, since you mention cylindrical coords, I still have
to get around to taking a closer look at your hlstorgb algorithm,
and figuring out exactly how that trivial-looking arithmetic
projects h,l,s values onto the rotated r,g,b cube axes. Cute.
-- 
John Forkosh  ( mailto:  j@f.com  where j=john and f=forkosh )

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decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-01 12:15 +0000
  Re: decorative random colors algorithm gernot.hoffmann@hs-emden-leer.de - 2012-07-01 07:59 -0700
    Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-02 07:58 +0000
      Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-02 12:29 +0000
  Re: decorative random colors algorithm Nobody <nobody@nowhere.com> - 2012-07-01 16:25 +0100
    Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-02 08:28 +0000
  Re: decorative random colors algorithm gernot.hoffmann@hs-emden-leer.de - 2012-07-03 01:17 -0700
    Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-03 10:27 +0000
  Re: decorative random colors algorithm gernot.hoffmann@hs-emden-leer.de - 2012-07-03 21:50 -0700
    Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-04 05:15 +0000
      Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-04 08:01 +0000
  Re: decorative random colors algorithm gernot.hoffmann@hs-emden-leer.de - 2012-07-04 02:20 -0700
    Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-04 09:51 +0000
      Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-04 10:59 +0000
        Re: decorative random colors algorithm Wally W. <ww84wa@aim.com> - 2012-07-04 09:03 -0400
          Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-04 13:46 +0000
            Re: decorative random colors algorithm Wally W. <ww84wa@aim.com> - 2012-07-04 12:39 -0400
  Re: decorative random colors algorithm gernot.hoffmann@hs-emden-leer.de - 2012-07-04 07:10 -0700
    Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-04 15:05 +0000
  Re: decorative random colors algorithm gernot.hoffmann@hs-emden-leer.de - 2012-07-04 09:12 -0700
    Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-05 03:18 +0000
      Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-05 05:54 +0000
        Re: decorative random colors algorithm John Forkosh <forkosh@panix.com> - 2012-07-05 12:23 +0000
  Re: decorative random colors algorithm "Skybuck Flying" <Windows7IsOK@DreamPC2006.com> - 2012-07-05 07:48 +0200
    Re: decorative random colors algorithm JohnF <john@please.see.sig.for.email.com> - 2012-07-05 06:14 +0000
    Re: decorative random colors algorithm Wally W. <ww84wa@aim.com> - 2012-07-05 07:30 -0400

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