The Lookup command looks up color in P.

The argument color can be a string that is the name of a color in P or a positive integer index.

If fast is given, P will not be expanded automatically when a numeric index is given beyond the current size of the palette.

The shade option controls the automatic transformation of colors of P for use with different plot objects. For example, if you make a plot with a point, a line, and a filled region and want their colors to look similar on a white background, you could use the colors returned by Lookup(P,1,shade="point"), Lookup(P,1,shade="line"), and Lookup(P,1,shade="fill") respectively.

The fast and shade options do not apply to palette of type dictionary.

$P≔\mathrm{ColorTools}:-\mathrm{GetPalette}\left(''spring''\right)$

$P≔⟨Palette\; Spring:BlueRoseYellowGreenBlueGreenVioletCobaltYellowPurpleRedGreenBluePaleGreenOrangePurpleGreenSeaBluePaleYellowPaleBlueGreen⟩$

$\mathrm{Lookup}\left(P\,1\right)$

$⟨RGB\; :\; Blue⟩$

$\mathrm{Lookup}\left(P\,''Purple''\right)$

$⟨RGB\; :\; Purple⟩$

$\mathrm{Lookup}\left(P\,1\,\mathrm{shade}=''fill''\right)$

$⟨RGB\; :\; 0.217\; 0.558\; 0.898⟩$

$\mathrm{Lookup}\left(P\,''Cobalt''\,\mathrm{shade}=''point''\right)$

$⟨RGB\; :\; 0.236\; 0.443\; 0.6⟩$

$\mathrm{Lookup}\left(P\,10\right)$

$⟨RGB\; :\; Pale\; Green⟩$

$\mathrm{Lookup}\left(P\,\mathrm{numcolors}\left(P\right)+1\right)$

$⟨RGB\; :\; 0\; 0\; 0⟩$

$\mathrm{Lookup}\left(P\,\mathrm{numcolors}\left(P\right)+100\,\mathrm{fast}\right)$

Error, (in ColorTools:-Palette:-Lookup) invalid color 116 is not defined in this palette

$\mathrm{Lookup}\left(P\,''Blurple''\right)$

Error, (in ColorTools:-Palette:-Lookup) invalid color Blurple is not defined in this palette

The ColorTools[Palette][Lookup] command was introduced in Maple 16.

For more information on Maple 16 changes, see Updates in Maple 16.