This page explains the math behind these pictures, and how you can make your own.
Colors
Let's start off with the color scheme that GeoGebra uses for the dynamic color. It uses a normal red, green, and blue mixing, the same that computers do. The highest intensity for any color section (red, green, or blue) is 1, and the lowest is 0. Since it's such a small range, GeoGebra lets you pass in any value, and I'm pretty certain that it passes it through something like this, to put it in the range:adjustedColor=abs(rawColor%2)
where abs() means the absolute value, and % means the remainder of integer division (modulus).
