Camera Canon Digital Forum Threads
When I travel on assignment, I often have several digital cameras available for my use. They may vary from a compact "Point & Shoot," to a relatively massive professional model, such as the Canon EOS-1Ds Mark III. No matter which I use, someone inevitably asks "How many pixels does that have?" I have learned to just answer the popular question directly and simply, even though that information is of limited use to most casual photographers.
How Pixels Work in a Camera
Very simply put: a pixel is a very small (essentially impossible to discern with the naked eye) rectangle of material that changes its characteristics when briefly exposed to light. When millions of them are applied to a flat rigid surface, they become the "film" in a digital camera. When light is reflected from a subject, passes through the camera's lens, and strikes that "film" (let's call it by a more correct name: "sensor"), a latent image is created, in which each pixel temporarily records and stores a record of the quality of light having hit it. Almost immediately, the camera's built-in computer reads that information, clears the sensor so that it is ready to accept another image, and then processes the data, creating a photo file, so that the image can be viewed on the camera's LCD screen, and saved for further future use.
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