number=nonnegint

the number of intermediate colors to compute (default is 10)

space=string

the color space in which to compute the intermediate colors. By default this is inferred from the colors spaces of the input.

best

if this keyword is given, a heuristic is used to get a well-spaced set of colors

displayable

if this keyword is given, then each output color will be displayable

The Gradient command computes a number of intermediate colors that transition between the two colors in the input range.

with(ColorTools):

G := Gradient("Red".."Blue");

$G≔\left[⟨RGB\; :\; 1\; 0\; 0⟩\,⟨RGB\; :\; 0.909\; 0\; 0.0909⟩\,⟨RGB\; :\; 0.818\; 0\; 0.182⟩\,⟨RGB\; :\; 0.727\; 0\; 0.273⟩\,⟨RGB\; :\; 0.636\; 0\; 0.364⟩\,⟨RGB\; :\; 0.545\; 0\; 0.455⟩\,⟨RGB\; :\; 0.455\; 0\; 0.545⟩\,⟨RGB\; :\; 0.364\; 0\; 0.636⟩\,⟨RGB\; :\; 0.273\; 0\; 0.727⟩\,⟨RGB\; :\; 0.182\; 0\; 0.818⟩\,⟨RGB\; :\; 0.0909\; 0\; 0.909⟩\,⟨RGB\; :\; 0\; 0\; 1⟩\right]$

H := Gradient("Red".."Blue", best);

$H≔\left[⟨RGB\; :\; 1\; 0\; 0⟩\,⟨RGB\; :\; 0.967\; 0\; 0.176⟩\,⟨RGB\; :\; 0.933\; 0\; 0.27⟩\,⟨RGB\; :\; 0.896\; 0\; 0.351⟩\,⟨RGB\; :\; 0.857\; 0\; 0.429⟩\,⟨RGB\; :\; 0.813\; 0\; 0.505⟩\,⟨RGB\; :\; 0.762\; 0\; 0.583⟩\,⟨RGB\; :\; 0.703\; 0\; 0.661⟩\,⟨RGB\; :\; 0.63\; 0\; 0.742⟩\,⟨RGB\; :\; 0.536\; 0\; 0.825⟩\,⟨RGB\; :\; 0.397\; 0\; 0.911⟩\,⟨RGB\; :\; 0\; 0\; 1⟩\right]$

Swatches([G[], H[]], rows=2);

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

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