lerp( color, alpha ) {

		this.r += ( color.r - this.r ) * alpha;
		this.g += ( color.g - this.g ) * alpha;
		this.b += ( color.b - this.b ) * alpha;

		return this;

	}
Linearly interpolates this color's RGB values toward the RGB values of the
given color. The alpha argument can be thought of as the ratio between
the two colors, where `0.0` is this color and `1.0` is the first argument.

@param {Color} color - The color to converge on.
@param {number} alpha - The interpolation factor in the closed interval `[0,1]`.
@return {Color} A reference to this color.