Image convert from jpg to BMP (black & white)

Question

Hi everybody
here i am converting a jpg file to 2 bit monochrome image.
Though this program is making the bmp monochrome image of passing jpg image.
but the program is hanged in between.
I don't understand the why it is hanging..though it is generating the result.
please help me to solve the hanging problem.
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source output is:
C:\j2sdk1.4.1_02\bin>java jaiexp.JAISampleProgram6 aish5.jpg
1
2
FarmHouse2.bmp image
ERROR: it doesn't finish gracefully....!!
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source code
package jaiexp;
import java.awt.Frame;
import java.awt.image.renderable.ParameterBlock;
import java.io.IOException;
import javax.media.jai.Interpolation;
import javax.media.jai.JAI;
import com.sun.media.jai.codec.BMPEncodeParam;
import javax.media.jai.RenderedOp;
import com.sun.media.jai.codec.FileSeekableStream;
import javax.media.jai.widget.ScrollingImagePanel;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.image.renderable.*;
import javax.media.jai.*;
import javax.media.jai.widget.*;
import com.sun.media.jai.codec.*;
     * This program decodes an image file of any JAI supported
     * formats, such as GIF, JPEG, TIFF, BMP, PNM, PNG, into a
     * convert it to BMP and save it as bmp file
     public class JAISampleProgram6 {
          /** The main method. */
          public static void main(String[] args) {
               // Define the source and destination file names.
               String outputFile = "C:\\j2sdk1.4.1_02\\bin\\jaiexp\\FarmHouse2.bmp";
               Image bwImage = null;
               /* Validate input. */
               if (args.length != 1) {
                    System.out.println("Usage: java JAISampleProgram " + "input_image_filename");
                    System.exit(-1);
               }//if ends
               * Create an input stream from the specified file name
               * to be used with the file decoding operator.
               Image colorImage = null;
               try {
                    colorImage = Toolkit.getDefaultToolkit().createImage(args[0]);
               } catch (Exception e) {
                    e.printStackTrace();
                    System.exit(0);
               }//try catch ends
               ImageFilter filter = new BlackWhiteFilter();
               ImageProducer producer = new FilteredImageSource(colorImage.getSource(),filter);
               bwImage = Toolkit.getDefaultToolkit().createImage(producer);
               // Create the ParameterBlock.
               ParameterBlock pb = new ParameterBlock();
               pb.add(bwImage);
               // Create the AWTImage operation.
               //PlanarImage im = (PlanarImage)JAI.create("awtImage", pb);
               RenderedOp image1 = (RenderedOp)JAI.create("AWTImage", pb);
               System.out.println("1");
               try {
                    FileOutputStream stream = new FileOutputStream(outputFile);
                    System.out.println("2");
                    javax.media.jai.operator.EncodeDescriptor.create(image1,stream,"BMP",null,null);
System.out.println("3");
                    javax.media.jai.operator.FileStoreDescriptor.create(image1,outputFile,"BMP",null,null,null);
                    System.out.println("4");
                    stream.close();
               }catch(Exception e){
                    System.out.println("Error:"+e);
               }//try catch ends
               System.out.println("5");
          }//fun ends
     }//class ends
     class BlackWhiteFilter extends RGBImageFilter{
     public int filterRGB(int x, int y, int rgb){
     int alpha = (rgb >> 24) & 0xff;
     int red = (int)(((rgb >> 16) & 0xff) * 0.3f);
     int green = (int)(((rgb >> 8) & 0xff) * 0.59f);
     int blue = (int)((rgb & 0xff) * 0.11f);
     int bws = ((red+green+blue) > 127) ? 255 : 0;
     return ((alpha & 0xFF) << 24) | ((bws & 0xFF) << 16) | ((bws & 0xFF) << 8) | ((bws & 0xFF) << 0);
     }//class ends
thanks in advance.
regards
- Deepak
email: [email protected]
     

Answer 1

Also keep in mind that there are two definitions of bitmap. You want the 2-color version where each bit represents one color or the other. However, thanks to Microsoft, their bitmaps are really just uncompressed strings of RGB values, storing each pixel in multiple bits.