Indicates whether an image is a monochrome (1 bit black and white) image. - Java 2D Graphics

Java examples for 2D Graphics:Image

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Description

Indicates whether an image is a monochrome (1 bit black and white) image.

Demo Code

/*//from   w  w w.  j  a v  a  2 s  . c  o m
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */
//package com.java2s;

import java.awt.image.ColorModel;
import java.awt.image.IndexColorModel;
import java.awt.image.RenderedImage;

public class Main {
    /**
     * Indicates whether an image is a monochrome (1 bit black and white) image.
     * 
     * @param img
     *            the image
     * @return true if it's a monochrome image
     */
    public static boolean isMonochromeImage(final RenderedImage img) {
        return getColorIndexSize(img) == 2;
    }

    /**
     * Returns the size of the color index if the given image has one.
     * 
     * @param img
     *            the image
     * @return the size of the color index or 0 if there's no color index
     */
    public static int getColorIndexSize(final RenderedImage img) {
        final ColorModel cm = img.getColorModel();
        if (cm instanceof IndexColorModel) {
            final IndexColorModel icm = (IndexColorModel) cm;
            return icm.getMapSize();
        } else {
            return 0;
        }
    }
}

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