Serializing Binary Data

Is it possible to serialize binary data? An image for example. I am trying to accomplish this: 1. Build web page. 2. Retrieve dynamically built image from another physical server. 3. Serialize the image and store it in some type of session variable 4. Unserialize this image and display it inline with html around it. I realize this is terribly inefficient, but there are several factors as to why it has to be accomplished this way.