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Digital photography is a form of photography that uses cameras that, instead of storing an image on photographic film, stores it as a digital file that can be opened and viewed on a computer. Digital cameras only became popular in the late 1990s, with previous cameras using light to expose photo-sensitive material, with pictures later being developed in chemical solutions to develop the picture on the paper. Digital images are created by computer-based photo electric techniques and don't need chemical development. Technologies for digital cameras are developing at a fast rate, with high pixel counts enabling cameras to take clear images of galaxies situated millions of miles away.