int color1,color2;
		float [] hsb = new float[3];
		//init color1 here
		Color.RGBtoHSB((color1 >> 16) & 0xFF, (color1 >> 8) & 0xFF, color1 & 0xFF, hsb);
		hsb[0] = (hsb[0]+180) % 360;
		color2 = Color.HSBtoRGB(hsb[0], hsb[1], hsb[2]);