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Apache Commons Imaging (previously Sanselan) is a pure-Java image library.
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/*
 * 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 org.apache.commons.imaging.formats.pnm;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;

import org.apache.commons.imaging.ImageWriteException;

class PgmWriter implements PnmWriter {

    private final boolean rawbits;

    public PgmWriter(final boolean rawbits) {
        this.rawbits = rawbits;
    }

    @Override
    public void writeImage(final BufferedImage src, final OutputStream os, final Map params)
            throws ImageWriteException, IOException {
        // System.out.println
        // (b1 == 0x50 && b2 == 0x36)
        os.write(0x50);
        os.write(rawbits ? 0x35 : 0x32);
        os.write(PnmConstants.PNM_SEPARATOR);

        final int width = src.getWidth();
        final int height = src.getHeight();

        os.write(Integer.toString(width).getBytes("US-ASCII"));
        os.write(PnmConstants.PNM_SEPARATOR);

        os.write(Integer.toString(height).getBytes("US-ASCII"));
        os.write(PnmConstants.PNM_SEPARATOR);

        os.write(Integer.toString(255).getBytes("US-ASCII")); // max component value
        os.write(PnmConstants.PNM_NEWLINE);

        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                final int argb = src.getRGB(x, y);
                final int red = 0xff & (argb >> 16);
                final int green = 0xff & (argb >> 8);
                final int blue = 0xff & (argb >> 0);
                final int sample = (red + green + blue) / 3;

                if (rawbits) {
                    os.write((byte) sample);
                } else {
                    os.write(Integer.toString(sample).getBytes("US-ASCII")); // max component value
                    os.write(PnmConstants.PNM_SEPARATOR);
                }
            }
        }
    }

}