code: function(c, t) {
  		if(t === undefined) { t = 0.5; }
  		var crgb = c.toRGBAArray();
  		this.rgb[0] += (crgb[0] - this.rgb[0]) * t;
  		this.rgb[1] += (crgb[1] - this.rgb[1]) * t;
  		this.rgb[2] += (crgb[2] - this.rgb[2]) * t;
  		this._alpha += (c._alpha - this._alpha) * t;
  		return this.setRGB(this.rgb);
  	}
docs: Blends the color with the given one by the stated amount
  @param c
  target color
  @param t
  interpolation factor
  @return itself