Convert image to byte[] and viceversa

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



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





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?

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

Too difficult for "beginning"; moving thread.