1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 package org.apache.commons.imaging.formats.png.chunks; 18 19 import static org.apache.commons.imaging.common.BinaryFunctions.read4Bytes; 20 21 import java.io.ByteArrayInputStream; 22 import java.io.IOException; 23 24 public class PngChunkGama extends PngChunk { 25 26 private final int gamma; 27 28 public PngChunkGama(final int length, final int chunkType, final int crc, final byte[] bytes) throws IOException { 29 super(length, chunkType, crc, bytes); 30 31 final ByteArrayInputStream is = new ByteArrayInputStream(bytes); 32 gamma = read4Bytes("Gamma", is, "Not a Valid PNG File: gAMA Corrupt", getByteOrder()); 33 } 34 35 public double getGamma() { 36 return 1.0 / (gamma / 100000.0); 37 } 38 39 }