Here you can find the source of getGrayFilter()
public static GrayFilter getGrayFilter()
//package com.java2s; /*//from ww w .j a v a2 s . co m * Copyright 2000-2014 JetBrains s.r.o. * * 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 javax.swing.*; public class Main { private static final GrayFilter DEFAULT_GRAY_FILTER = new GrayFilter(true, 65); private static final GrayFilter DARCULA_GRAY_FILTER = new GrayFilter(true, 30); public static GrayFilter getGrayFilter() { return isUnderDarcula() ? DARCULA_GRAY_FILTER : DEFAULT_GRAY_FILTER; } public static boolean isUnderDarcula() { return UIManager.getLookAndFeel().getName().equals("Darcula"); } }