Thread: image converting to byte

hi , am converting gray image to byte array and v disice versa by using bytearrayoutputstream and inputstream but it didn't displayed image am try by getting width and hieght but tere difference in size any body help me please with this problem

Hi
i have problem with converting gray image to byte array and byte array to image in java, the size of input image are difference
with the output image ,anybody can help me

import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.awt.image.WritableRaster;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;


public class ImageProMainClass2 {

public ImageProMainClass2() {

}

public static byte[] imgFileToByteArray(String imgFileName){

int width = 0 ;
int height = 0 ;
byte[] readData = null;
try {
File imgPath = new File(imgFileName);
BufferedImage bufferedImage = ImageIO.read(imgPath);

// get DataBufferBytes from Raster
WritableRaster raster = bufferedImage .getRaster();
DataBufferByte data = (DataBufferByte) raster.getDataBuffer();
readData=data.getData();

//return ( readData );


} catch (IOException e) {
e.printStackTrace();
}

return readData;
}
public static BufferedImage byteArrayToBufImg(byte[] array)
{
BufferedImage imgout = new BufferedImage(12, 12, BufferedImage.TYPE_INT_ARGB_PRE);
WritableRaster wr = imgout.getRaster();
int data = 0 ;
int index = 0 ;
for(int i = 0 ; i<12 ;i++){
for(int j = 0 ; j<12 ;j++){
wr.setSample(i, j, 0, array[index]);
index++;
}
}
for(int i = 0 ; i<array.length;i++){
System.out.println("this is array2["+i+"]:"+array[i]);
}
return imgout;
}

public static void main(String[] args) {
// TODO Auto-generated method stub

String filename = "strawberry.png" ;
byte[] imgData = imgFileToByteArray(filename);
BufferedImage img = byteArrayToBufImg(imgData);

try {
ImageIO.write(img, "png", new File("out2.png"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}





}

}

--- Update ---

thanks very much for answer my question i convert image to array of byte and then convert the array of byte to image again , but when i convert the array of byte to image the image difference with the original image in size, i take gray scale png image
regards

import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.awt.image.WritableRaster;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
 
import javax.imageio.ImageIO;
 
 
public class ImageProMainClass2 {
 
public ImageProMainClass2() {
 
}
 
public static byte[] imgFileToByteArray(String imgFileName){
 
int width = 0 ;
int height = 0 ;
byte[] readData = null;
try {
File imgPath = new File(imgFileName);
BufferedImage bufferedImage = ImageIO.read(imgPath);
 
// get DataBufferBytes from Raster
WritableRaster raster = bufferedImage .getRaster();
DataBufferByte data = (DataBufferByte) raster.getDataBuffer();
readData=data.getData();
 
//return ( readData );
 
 
} catch (IOException e) {
e.printStackTrace();
}
 
return readData;
}
public static BufferedImage byteArrayToBufImg(byte[] array)
{ 
BufferedImage imgout = new BufferedImage(12, 12, BufferedImage.TYPE_INT_ARGB_PRE);
WritableRaster wr = imgout.getRaster();
int data = 0 ;
int index = 0 ;
for(int i = 0 ; i<12 ;i++){
for(int j = 0 ; j<12 ;j++){
wr.setSample(i, j, 0, array[index]);
index++;
}
}
for(int i = 0 ; i<array.length;i++){
System.out.println("this is array2["+i+"]:"+array[i]);
}
return imgout;
}
 
public static void main(String[] args) {
// TODO Auto-generated method stub
 
String filename = "strawberry.png" ;
byte[] imgData = imgFileToByteArray(filename);
BufferedImage img = byteArrayToBufImg(imgData);
 
try {
ImageIO.write(img, "png", new File("out2.png"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
 
 
 
 
 
}
 
}

i used small logo by size 12*12 the input logo size 28 kb the out is logo 128 bytes am try to do the same code but depending on size and by using input and output stream but i still have size problem issue
regard

i get the byte from buffered image and restore them from buffered image but i still have the same problem ,second i test it by image correlation measure to test their similarity the correlation zero , my head go to explode with it

my code is to long i embed image bit to audio but when restore the image my byte restored correctly but i have problem with reconstruct the image
i get the the error reading png file so i skip 8 byte befor embedding and call the original image in extract just to get the header pa
rt from it

 File file=new File(imgName);
       byte[] originalImage=null;
 
 
     try{ // here i read the original image to get the header  
         BufferedImage Image = ImageIO.read(file);
             ByteArrayOutputStream aos = new ByteArrayOutputStream();
                ImageIO.write(Image, "gif", aos);
                //System.out.println("this is bytearray:"+baos);
                aos.flush();
                originalImage = aos.toByteArray();
// here is the returned bit to reconstruct the image
          BitSet result=returnphase();
       /
        byte[] array=result.toByteArray();
// skip 14 if it is gif type
        for (int i=14; i<array.length;i++)
        {// put the returned in original   
         originalImage[i]=array[i];
 
        }
        for (int i=0; i<originalImage.length;i++)
        { // here i concatenate with the header  
            System.out.println("this is origin["+i+"]:"+originalImage[i]);
        }
 
         ByteArrayInputStream in = new ByteArrayInputStream(originalImage);
          final  BufferedImage bufferedImage = ImageIO.read(in);
// here i displayed the image in fff file
             File imagefile =new File("fff.gif");
            ImageIO.write(bufferedImage, "gif",imagefile );
     }catch (Exception ex) {
            ex.printStackTrace();

i told you my code is too long it i 20 class but i get the errorerror reading png header file ) or any type of image please if you can help me