Dithering a 24-bit RGB image to a monochrome (1-bit or bilevel) image
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// R G B T o B i l e v e l //
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package omr.jai;
import java.awt.*;
import java.awt.color.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.awt.image.renderable.*;
import java.util.*;
import javax.media.jai.*;
import javax.media.jai.operator.*;
import javax.media.jai.widget.*;
/**
* Demo code for dithering a 24-bit RGB image to a monochrome (1-bit
* or bilevel) image. The source image must be an 24-bit RGB image.
* The result is displayed.
*
* Usage: java RGBToBilevel filename [true]
*
* If the second argument is present and equal to "true" then error diffusion
* will be used; otherwise ordered dithering will be used.
*/
public class RGBToBilevel extends Frame {
public static void main(String[] args) {
new RGBToBilevel(args[0],
args.length > 1 ? args[1].equals("true") : false);
}
RGBToBilevel(final String fileName,
boolean isErrorDiffusion)
{
// Load the file.
PlanarImage src = JAI.create("fileload", fileName);
// Load the ParameterBlock for the dithering operation
// and set the operation name.
ParameterBlock pb = new ParameterBlock();
pb.addSource(src);
String opName = null;
if(isErrorDiffusion) {
opName = "errordiffusion";
LookupTableJAI lut =
new LookupTableJAI(new byte[][] {{(byte)0x00, (byte)0xff},
{(byte)0x00, (byte)0xff},
{(byte)0x00, (byte)0xff}});
pb.add(lut);
pb.add(KernelJAI.ERROR_FILTER_FLOYD_STEINBERG);
} else {
opName = "ordereddither";
ColorCube cube = ColorCube.createColorCube(DataBuffer.TYPE_BYTE,
0, new int[] {2, 2, 2});
pb.add(cube);
pb.add(KernelJAI.DITHER_MASK_443);
}
// Create a layout containing an IndexColorModel which maps
// zero to zero and unity to 255; force SampleModel to be bilevel.
ImageLayout layout = new ImageLayout();
byte[] map = new byte[] {(byte)0x00, (byte)0xff};
ColorModel cm = new IndexColorModel(1, 2, map, map, map);
layout.setColorModel(cm);
SampleModel sm = new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE,
src.getWidth(),
src.getHeight(),
1);
layout.setSampleModel(sm);
// Create a hint containing the layout.
RenderingHints hints = new RenderingHints(JAI.KEY_IMAGE_LAYOUT,
layout);
// Dither the image.
final PlanarImage dst = JAI.create(opName, pb, hints);
// Exit on window closing.
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent we) {
JAI.create("filestore", dst, fileName + ".out", "PNG", null);
System.exit(0);
}
});
// Display the result.
//// ATTENTION A REMPLACER : add(new ScrollingImagePanel(dst, dst.getWidth(), dst.getHeight()));
pack();
setVisible(true);
}
}
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