In recent years, digital cameras have become increasingly popular as an alternative to cameras that use film. A digital image is a long string of 1s and 0s representing all the colored light dots, known as pixels, which collectively make up the image. Digital cameras employ image sensors, such as CCDs or CMOS sensors, in place of film. CCDs are collections of tiny, light-sensitive diodes that convert light into electrical charges, which are then digitized to create a digital image. Digital cameras, too, work on the principle of filtering the three primary colors of red, green and blue. CMOS and CCD sensors resemble black-and-white film in that they respond only to the strength of light. In digital cameras, the light beam is split light into its RGB elements before striking the light sensor, which then reads the strength of each color per pixel, and converts that information into digital data. Unlike film, digital images do not deteriorate with age, and can be enjoyed in various ways, such as viewing on a TV or PC screen, or by outputting them using a printer.