The AddPalette command registers the palette P with the name N so that it will be usable by all ColorTools commands.  The string N must contain only alphanumeric characters.  It will be stored in lowercase but the capitalization will be preserved.

It returns a list of the normalized names of all the known palettes after the addition.

with(ColorTools):

P := Palette(["Red"=Color("#f00"), "Blue"=Color("#00f"), "Green"=Color("#0f0")]);

$P≔⟨Palette:RedBlueGreen⟩$

AddPalette("Primary", P);

$\left[''bright''\,''dalton''\,''executive''\,''mono''\,''nautical''\,''niagara''\,''oldplots''\,''patchwork''\,''spring''\,''css''\,''cvd''\,''cvd2''\,''cvd3''\,''html''\,''maplev''\,''x11''\,''resene''\,''generic''\,''xterm''\,''solarized''\,''xkcd''\,''beersrm''\,''inferno''\,''magma''\,''plasma''\,''viridis''\,''cividis''\,''turbo''\,''twilight''\,''colorwheel''\,''coolwarm''\,''divergebjy''\,''divergebkr''\,''divergebky''\,''divergebwy''\,''divergegwv''\,''divergerainbow''\,''isocircle''\,''isoluminant''\,''labwheel''\,''rainbow''\,''hue''\,''rgbwheel''\,''primary''\right]$

NameToRGB24("Primary Green");

$\left[0\,255\,0\right]$

NearestNamedColor([0,255,0], palette="Primary");

$\left[''Primary\; Green''\,0.\right]$

RemovePalette("Primary");

$\left[''bright''\,''dalton''\,''executive''\,''mono''\,''nautical''\,''niagara''\,''oldplots''\,''patchwork''\,''spring''\,''css''\,''cvd''\,''cvd2''\,''cvd3''\,''html''\,''maplev''\,''x11''\,''resene''\,''generic''\,''xterm''\,''solarized''\,''xkcd''\,''beersrm''\,''inferno''\,''magma''\,''plasma''\,''viridis''\,''cividis''\,''turbo''\,''twilight''\,''colorwheel''\,''coolwarm''\,''divergebjy''\,''divergebkr''\,''divergebky''\,''divergebwy''\,''divergegwv''\,''divergerainbow''\,''isocircle''\,''isoluminant''\,''labwheel''\,''rainbow''\,''hue''\,''rgbwheel''\right]$

The ColorTools[AddPalette] command was introduced in Maple 16.

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