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Finally got something working using this link below. http://ros.org/rosdoclite/groovy/api/rviz_python_tutorial/html/

To create an image panel, all I needed to do was write a config file(which included a image display panel and the topic to subscribe from) and then load that config file.

Instead of manually creating the config file, I open rviz and then created a Display Panel in that and then added image to the Display and then set the topic in the properties for the image. Then, I saved these configs in from the File menu and am currently using it.