JavaAdvancedImaging.java

/*******************************************************************************
 * Copyright (c) MOBAC developers
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ******************************************************************************/
package mobac.optional;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;

import javax.media.jai.RenderedOp;
import javax.media.jai.operator.ColorQuantizerDescriptor;

/**
 * Centralizes all methods that require the optional Java Advanced Imaging
 * library.
 * 
 */
public class JavaAdvancedImaging {

	// private static final Logger log =
	// Logger.getLogger(JavaAdvancedImaging.class);

	public static BufferedImage colorReduceMedianCut(BufferedImage image, int colorCount) {
		int pixelBits = image.getColorModel().getPixelSize();
		if (pixelBits != 24) {
			/*
			 * For preventing the javax.media.jai.util.ImagingException: All
			 * factories fail for the operation "ColorQuantizer" we have to
			 * create a "compatible" (e.g. TYPE_3BYTE_BGR) BufferedImage
			 */
			BufferedImage trueColorImage = new BufferedImage(image.getWidth(), image.getHeight(),
					BufferedImage.TYPE_3BYTE_BGR);
			Graphics g = trueColorImage.getGraphics();
			g.drawImage(image, 0, 0, null);
			g.dispose();
			image = trueColorImage;
		}
		RenderedOp ro = ColorQuantizerDescriptor.create(image, ColorQuantizerDescriptor.MEDIANCUT, // 
				new Integer(colorCount), // Max number of colors
				null, null, new Integer(1), Integer.valueOf(1), null);
		return ro.getAsBufferedImage();
	}
}