Re: Color names and the 10 elementary colors?
- To: mathgroup at smc.vnet.net
- Subject: [mg69513] Re: Color names and the 10 elementary colors?
- From: p-valko at tamu.edu
- Date: Thu, 14 Sep 2006 06:56:41 -0400 (EDT)
- References: <200607010912.FAA20399@smc.vnet.net><ee8gls$iqm$1@smc.vnet.net>
I am sorry for posting my previous response for three times. First I
posted it without the first line. Second, I repeated the post with the
first line included. However, I do not know what happened the third
time.
Peter
p-valko at tamu.edu wrote:
> Part[nm, Position[Map[ToExpression[#] &, nm], _RGBColor] // Flatten]
>
> ???
>
> Murray Eisenberg wrote:
> > In Mathematica 5.2, how does one find all the names of BUILT-IN colors
> > -- as opposed to those given names only in Graphics`Colors`?
> >
> > Bob Hanlon wrote:
> > > Needs["Graphics`"];
> > >
> > > All Colors and GrayLevels:
> > >
> > > mc = DeleteCases[Select[Names[],
> > > (Head[ToExpression[#]] == RGBColor ||
> > > Head[ToExpression[#]] == GrayLevel) &],
> > > _?(# == "System`Convert`MathMLDump`$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