Here you can find the source of getImageIconFilter()
private static RGBImageFilter getImageIconFilter()
//package com.java2s; /**/*w w w . j ava 2 s .c om*/ * Copyright 2013-2018 Gaurav Gupta * * 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.image.RGBImageFilter; import javax.swing.UIManager; public class Main { private static RGBImageFilter imageIconFilter = null; private static RGBImageFilter getImageIconFilter() { if (null == imageIconFilter) { Object obj = UIManager.get("nb.imageicon.filter"); //NOI18N if (obj instanceof RGBImageFilter) { imageIconFilter = (RGBImageFilter) obj; } } return imageIconFilter; } }