return images from Wcf service and access it on clientside ajax

Hi,
I am trying to accomplish gettting images from a WCF service via clientside and displaying it on client browser, but I am not sure how I can return images from a WCF service, i mean the format of the image which will be supported from client side ajax.
Can I return it as System.Drawing.Image? If so , how can I access it on clientside? Or do I have to return it in some other format.
Thanks in advance.
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