How to retain the same resolution while croping a tiff image using jai api

Question

Hi all,
I have designed a program to crop a tiff image.But after croping the tiff,the resultant file resolution is not the same as the original source file.
In the program,the source file Nadeshiko_v1_02.tif has the resolution(X) of 1200 DPI and resolution(Y) has 1200 DPI pixels.
But after croping the resolution of output file is 100 DPI.
Please give me some idea on how to retain the same resolution.
<code>
package jai;
import java.awt.Frame;
import java.awt.image.RenderedImage;
import java.awt.image.renderable.ParameterBlock;
import java.awt.image.renderable.RenderableImage;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.imageio.*;
import javax.imageio.stream.ImageOutputStream;
import javax.media.jai.Interpolation;
import javax.media.*;
import javax.media.jai.JAI;
import javax.media.jai.PlanarImage;
import javax.media.jai.RenderedOp;
import javax.media.jai.widget.ScrollingImagePanel;
import com.sun.media.jai.codec.FileSeekableStream;
import com.sun.media.jai.codec.SeekableStream;
import com.sun.media.jai.codec.TIFFEncodeParam;
import javax.media.jai.OperationDescriptorImpl;
import java.io.*;
import java.util.Iterator;
import javax.media.jai.operator.*;
// import javax.media.jai.widget.ScrollingImagePanel;
public class crop {
          /** The main method. */
public static void main(String[] args) {
/* Validate input. */
/* if (args.length != 1) {
System.out.println("Usage: java JAISampleProgram " +
"input_image_filename");
// System.exit(-1);
float a=(float) 70.3;
float b=(float) 70.4;
float c=(float) 3100.3;
float d=(float) 5522.4;
* Create an input stream from the specified file name
* to be used with the file decoding operator.
String TIFF="TIFF";
FileSeekableStream stream = null;
try {
     stream = new FileSeekableStream("D:\\tif images\\Nadeshiko_v1_02.tif");
// stream = new FileSeekableStream("D:\\tif images\\Nadeshiko_v1_01.jpg");
} catch (IOException e) {
e.printStackTrace();
System.exit(0);
// Load the source image from a Stream.
RenderedImage im = JAI.create("stream", stream);
RenderedImage image2= CropDescriptor.create(im, a, b, c, d, null);
ScrollingImagePanel panel = new ScrollingImagePanel(image2, 100, 100);
// Create a frame to contain the panel.
Frame window = new Frame("JAI Image Cropping");
window.add(panel);
window.pack();
// window.show();
// Define the source and destination file names.
// String inputFile = "D:\\tif images\\Nadeshiko_v1_05.tif";
String outputFile = "D:\\tif images\\Nadeshiko_v1_04.tif";
// Save the image on a file. We cannot just store it, we must set the image encoding parameters
// to ensure that it will be stored as a tiled image.
TIFFEncodeParam tep = new TIFFEncodeParam();
tep.setWriteTiled(true);
tep.setTileSize(80,80);
JAI.create("filestore",image2,outputFile,"TIFF",null);
try {
               stream.close();
          } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
</code>
Thanks,
Sanat Meher

Answer 1

Try the following,
TIFFEncodeParam tep = new TIFFEncodeParam();
// Create {X,Y}Resolution fields.
TIFFField fieldXRes = new TIFFField(0x11A, TIFFField.TIFF_RATIONAL,
                                    1, new long[][] {{DPI_X, 1}});
TIFFField fieldYRes = new TIFFField(0x11B, TIFFField.TIFF_RATIONAL,
                                    1, new long[][] {{DPI_Y, 1}});
tep.setExtraFields(new TIFFField[] {fieldXRes, fieldYRes});