The theory seems simple. Light strikes the film in a camera, or a CCD and the different regions of intensity are recorded. But what I can't get my head over, is how a different portion of the film strip or CCD *knows* which part of the image it is supposed to be representing. For example, if I was to make a series of pinholes in a sheet of paper, I could view out of each one of them a complete image that is nearly identical to the the image from the hole beside it. If I was to try and record some details about the image, such as light intensity, general colour, it would have identical results as the hole beside it. How can a series of readings from a film or CCD be constructed to make a complete image? How can one small piece say it's looking at blue, and another small piece say it's looking at red? I just don't get how the image is divided up like that. When the total light information striking a small point on a 2d plane, should be almost completely identical to another small point beside it.