Hi. I have recently upgraded from a 2 megapixel camera to a 5 megapixel. I now seem to take huge photos (like A4 size). There doesn't seem to be anyway to make them smaller apart from selecting 3 megapixels on the camera. What is the point of all the pixels if I have to resize them anyway? Why did I buy a 5 megapixel camera if I am inly going to use 3? I thought maybe the resolution would be greater not just the size. I am really confused.

Is a pixel a fixed size?