Here you can find the source of inverse(Color c)
public static Color inverse(Color c)
//package com.java2s; /*// w w w. j a v a 2 s . c o m * This code is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This code is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program; if not, write to the Free * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, * MA 02111-1307, USA. */ import java.awt.Color; public class Main { public static Color inverse(Color c) { float rgb[] = new float[3]; c.getColorComponents(rgb); Color color = new Color(1f - rgb[0], 1f - rgb[1], 1f - rgb[2]); return color; } }