sub( color ) {

		this.r = Math.max( 0, this.r - color.r );
		this.g = Math.max( 0, this.g - color.g );
		this.b = Math.max( 0, this.b - color.b );

		return this;

	}
Subtracts the RGB values of the given color from the RGB values of this color.

@param {Color} color - The color to subtract.
@return {Color} A reference to this color.