/******************************************************************************* * Copyright 2014 by E-Government Innovation Center EGIZ, Graz, Austria * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a * joint initiative of the Federal Chancellery Austria and Graz University of * Technology. * * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by * the European Commission - subsequent versions of the EUPL (the "Licence"); * You may not use this work except in compliance with the Licence. * You may obtain a copy of the Licence at: * http://www.osor.eu/eupl/ * * Unless required by applicable law or agreed to in writing, software * distributed under the Licence is distributed on an "AS IS" basis, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the Licence for the specific language governing permissions and * limitations under the Licence. * * This product combines work with different licenses. See the "NOTICE" text * file for details on the various modules and licenses. * The "NOTICE" text file is part of the distribution. Any derivative works * that you distribute must include a readable copy of the "NOTICE" text file. ******************************************************************************/ package at.gv.egiz.pdfas.common.utils; import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.awt.image.ColorModel; import java.awt.image.IndexColorModel; import java.awt.image.WritableRaster; public class ImageUtils { public static BufferedImage removeAlphaChannel(BufferedImage src) { if (src.getColorModel().hasAlpha()) { // extract the alpha information // WritableRaster alphaRaster = src. //ColorModel cm = new ComponentColorModel(ColorSpace.getInstance(ColorSpace.CS_GRAY), // false, false, Transparency.OPAQUE, DataBuffer.TYPE_BYTE); //alpha = new BufferedImage(cm, alphaRaster, false, null); // create a RGB image without alpha BufferedImage image = new BufferedImage(src.getWidth(), src.getHeight(), BufferedImage.TYPE_INT_RGB); Graphics2D g = image.createGraphics(); g.setComposite(AlphaComposite.Src); g.drawImage(src, 0, 0, null); g.dispose(); return image; } return src; } public static BufferedImage convertRGBAToIndexed(BufferedImage src) { BufferedImage dest = new BufferedImage(src.getWidth(), src.getHeight(), BufferedImage.TYPE_BYTE_INDEXED); Graphics g = dest.getGraphics(); g.setColor(new Color(231, 20, 189)); g.fillRect(0, 0, dest.getWidth(), dest.getHeight()); // fill with a // hideous color // and make it // transparent dest = makeTransparent(dest, 0, 0); dest.createGraphics().drawImage(src, 0, 0, null); return dest; } public static BufferedImage makeTransparent(BufferedImage image, int x, int y) { ColorModel cm = image.getColorModel(); if (!(cm instanceof IndexColorModel)) return image; // sorry... IndexColorModel icm = (IndexColorModel) cm; WritableRaster raster = image.getRaster(); int pixel = raster.getSample(x, y, 0); // pixel is offset in ICM's // palette int size = icm.getMapSize(); byte[] reds = new byte[size]; byte[] greens = new byte[size]; byte[] blues = new byte[size]; icm.getReds(reds); icm.getGreens(greens); icm.getBlues(blues); IndexColorModel icm2 = new IndexColorModel(8, size, reds, greens, blues, pixel); return new BufferedImage(icm2, raster, image.isAlphaPremultiplied(), null); } }