Convert image to byte[] and viceversa

[Adriano Bellavita]

I use this method to convert an image to an array of byte

  
image = ImageIO.read(url);

ByteArrayOutputStream baos = new ByteArrayOutputStream();
			
ImageIO.write((RenderedImage)image, "png", baos);

byte[] data = baos.toByteArray();

  

When I try to reconvert the byte array into an Image by this code

PS: a is the byte array, y is an int array obtained by converting byte array like this

   int[] y = new int[a.length];
		
		for (int len = 0; len < a.length; len++){
			y[len] = a[len];
		} 

  
ByteArrayInputStream in = new ByteArrayInputStream(a);
		
		Image  image = ImageIO.read(in);

		BufferedImage bi = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_RGB); // retrieve image
	
		bi.setRGB(0, 0, image.getWidth(null), image.getHeight(null), y, 0, 0);
		
		File outputfile = new File("/home/Adriano/Scrivania/finalimage.png");

		ImageIO.write(bi, "png", outputfile);

		
  

but the final image I found on the desktop is not the real image!!! It has a black background with some vertical colored lines.

Where is my error? In the first or in the second part?

[David Newton]

I thought the byte data from a read was just the image data--does it include all the metadata included in the file format?

[Campbell Ritchie]

Too difficult for "beginning"; moving thread.