Converting a PNG image to an array of bytes and vice versa..

hi all,
i need to convert a PNG image to an array of bytes ,then converting back this array of bytes to The PNG image again ,i read this can be done using output streams but i feel like a dump and i can't fix the whole thingy out ! ,can anybody help me in this ,by explaining how can this be established????
Regards,
D.Roth

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