The digital camera is an input device, which stores images digitally. It converts light intensities into discrete numbers for storage on a storage media such as a hard disk or a flash disk (a type of secondary storage device). It does not require film to store or record the images as it stores images digitally, which can be downloaded to a computer system and can be printed. The main difference between a film based camera and a digital camera is that the digital camera has no film. Photo making is inexpensive and fast because it does not require film processing. Instead of film, digital cameras use a solid state device called an image sensor, which is usually a Charge Couple Device (CCD). It records colour images as intensities of red, green and blue that are stored as variable charges in a CCD matrix. The size of the matrix determines the resolution and colour depth.
