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MathGroup Archive 2006

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Re: Color names and the 10 elementary colors?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg69464] Re: Color names and the 10 elementary colors?
  • From: p-valko at tamu.edu
  • Date: Wed, 13 Sep 2006 04:02:20 -0400 (EDT)
  • References: <200607010912.FAA20399@smc.vnet.net><ee649s$5tm$1@smc.vnet.net>

Part[nm, Position[Map[ToExpression[#] &, nm], _RGBColor] // Flatten]

???

Murray Eisenberg wrote:
> In Mathematica 5.2, how does one find all the names of BUILT-IN colors
> -- as opposed to those given names only in Graphics`Colors`?
>
> Bob Hanlon wrote:
> > Needs["Graphics`"];
> >
> > All Colors and GrayLevels:
> >
> > mc = DeleteCases[Select[Names[],
> >         (Head[ToExpression[#]] == RGBColor ||
> >               Head[ToExpression[#]] == GrayLevel) &],
> >       _?(# == "System`Convert`MathMLDump`$defaultColor" ||
> >               # == "se" &)];
> >
> > Colors and GrayLevels not in AllColors:
> >
> > Complement[mc,AllColors]
> >
> > {AquamarineMedium,Black,Blue,BlueLight,BlueMedium,Brown,Cadet,CadmiumRedDeep,\
> > CadmiumRedLight,CadmiumYellowLight,CobaltVioletDeep,CoralLight,Cyan,\
> > GoldenrodDark,GoldenrodLight,GoldenrodPale,Gray,Green,GreenDark,GreenPale,\
> > KhakiDark,MadderLakeDeep,Magenta,NaplesYellowDeep,OliveGreenDark,Orange,\
> > OrchidDark,OrchidMedium,Pink,PinkLight,Purple,PurpleMedium,Red,SeaGreenDark,\
> > SeaGreenLight,SeaGreenMedium,SkyBlueDeep,SkyBlueLight,SlateBlueDark,\
> > SlateBlueLight,SlateBlueMedium,SlateGrayDark,SlateGrayLight,SpringGreenMedium,\
> > SteelBlueLight,TurquoiseDark,TurquoiseMedium,TurquoisePale,VioletDark,\
> > VioletRedMedium,VioletRedPale,ViridianLight,White,Yellow,YellowLight}
> >
> > Names["*Green*"]
> >
> > {ChromeOxideGreen,CinnabarGreen,CobaltGreen,DarkGreen,DarkOliveGreen,\
> > DarkSeaGreen,EmeraldGreen,ForestGreen,Green,GreenDark,GreenishUmber,GreenPale,\
> > GreenYellow,LawnGreen,LightSeaGreen,LimeGreen,MediumSeaGreen,\
> > MediumSpringGreen,OliveGreenDark,PaleGreen,PermanentGreen,SapGreen,SeaGreen,\
> > SeaGreenDark,SeaGreenLight,SeaGreenMedium,SpringGreen,SpringGreenMedium,\
> > YellowGreen}
> >
> > If you convert this to InputForm the string quotes will be visible.
> >
> >
> > Bob Hanlon
> >
> > ---- AES <siegman at stanford.edu> wrote:
> >> When I recently inquired about using the names of Mathematica colors
> >> ("CinnabarGreen", etc.) as label strings in a series of test plots,
> >> several responses proposed that I needed to manually input the names in
> >> quotes.  Brian Higgins suggested, however, a terse but somewhat arcane
> >> way to get color names as strings together with the corresponding RGB
> >> values with the Input line
> >>
> >>    allColorNames =
> >>        ({#1, ToColor[ ToExpression[#1], RGBColor]}&) /@ AllColors;
> >>
> >> so that the Input
> >>
> >>    allColorNames[[4]]
> >>
> >> produces the Output
> >>
> >>    { Apricot, RGBColor[1., 0.340007, 0.129994] }
> >>
> >> (although his Output showed quotes around "Apricot" and mine doesn't.)
> >>
> >> Since my objective was to test all varieties of Green, I added to this a
> >> more crudely programmed statement to generate a list of all the green
> >> color names and color values, viz.
> >>
> >>    allGreens={ };
> >>    Do[
> >>     If[ StringMatchQ[ allColorNames[[k,1]], "*Green*" ],
> >>       AppendTo[ allGreens, allColorNames[[k]] ] ],
> >>        {k, 1, Length[ allColorNames ]} ];
> >>
> >> This works fine -- until you notice that just plain "Green" itself is
> >> not in the resulting list.  In fact, Green (along with Red, Blue, Brown,
> >> Orange, and 4 or 5 other "elementary colors") is not in AllColors.
> >>
> >> I believe in earlier versions of Mathematica one had to use Graphics`Colors` to
> >> access even these elementary colors, and so they were presumably once
> >> included in AllColors (?); and I think I've learned somewhere that 10 or
> >> so of these elementary colors are now included within "plain
> >> Mathematica" and no long require calling the Graphics`Colors` package.
> >> But:
> >>
> >> 1)  I'd sure like to understand the logic of not continuing to use these
> >> colors in AllColors nonetheless.  Removing them seems a confusing and
> >> less than helpful choice to me at any rate.  And,
> >>
> >> 2)  Where -- or more important, how -- can the nonexpert user get at the
> >> list of these elementary colors?
> >>
> >> As a challenge, try invoking online Help on "Color" or "Colors" or any
> >> one of the elementary color names, and see if, using no more than 5
> >> subsequent mouse clicks within the Help screen, no typing,  and no
> >> pre-existing expert knowledge, just "common sense", you can find your
> >> way to the list of those colors.
> >>
> >
> >
>
> --
> Murray Eisenberg                     murray at math.umass.edu
> Mathematics & Statistics Dept.
> Lederle Graduate Research Tower      phone 413 549-1020 (H)
> University of Massachusetts                413 545-2859 (W)
> 710 North Pleasant Street            fax   413 545-1801
> Amherst, MA 01003-9305


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