Synopsis Interpolate between two colors.
Function
Color interpolateColor(Color from, Color to, real percentage)
Description Interpolate between two colors (in RGB space). The percentage indicates the distance between
the
from and the to color.
Examples 
from = color("Red");
to = color("Yellow");
b1 = box([size(50), fillColor(interpolateColor(from, to, 0.0))]);
b2 = box([size(50), fillColor(interpolateColor(from, to, 0.2))]);
b3 = box([size(50), fillColor(interpolateColor(from, to, 0.4))]);
b4 = box([size(50), fillColor(interpolateColor(from, to, 0.6))]);
b5 = box([size(50), fillColor(interpolateColor(from, to, 0.8))]);
b6 = box([size(50), fillColor(interpolateColor(from, to, 1.0))]);
render(hcat([b1, b2, b3, b4, b5, b6]));
gives: