Perception - What is it? How does it develop?

I listen to the what people discuss and how they discuss it and I conclude that perception is based on a persons belief system. Look at the News Media. A conservative will watch a news show and come away saying the show was "Liberal". A liberal will see nothing biased about the show.

Who is correct? The way a person views the program is based upon the preconceived beliefs before watching the show. If a person believes a show is biased toward a particular viewpoint it will be perceived this way. A person who approaches a show or idea open minded will better understand the concept being presented. The perception of the idea will not hinder the experience.