Here you can find the source of lighten(Color color, double strength)
public synchronized static Color lighten(Color color, double strength)
//package com.java2s; /*//from w w w .j av a 2 s . c o m * Copyright 2013 Serdar. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.awt.Color; public class Main { public synchronized static Color lighten(Color color, double strength) { int red = (int) ((color.getRed() * (1 - strength) / 255 + strength) * 255); int green = (int) ((color.getGreen() * (1 - strength) / 255 + strength) * 255); int blue = (int) ((color.getBlue() * (1 - strength) / 255 + strength) * 255); return new Color(red, green, blue); } }