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Added on: Thu, 11 Mar 2010 22:00:13 PST
End Date: Thursday Mar-18-2010 23:00:13 PDT
Added on: Thu, 11 Mar 2010 21:58:20 PST
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End Date: Thursday Mar-18-2010 22:27:31 PDT
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End Date: Tuesday Mar-16-2010 21:30:05 PDT
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End Date: Thursday Mar-18-2010 21:01:39 PDT
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Added on: Thu, 11 Mar 2010 18:47:40 PST
End Date: Thursday Mar-18-2010 19:47:40 PDT The digital camera is one of the most remarkable instances of this shift because it is so truly different from its predecessor. Conventional cameras depend entirely on chemical and mechanical processes you don't even need electricity to operate them. On the other hand, all digital cameras have a built-in computer, and all of them record images electronically. The new approach has been enormously successful. Since film still provides better picture quality, digital cameras have not completely replaced conventional cameras. But, as digital imaging technology has improved, digital cameras have rapidly become more popular. In this article, we'll find out exactly what's going on inside these amazing digital age devices. Photo: Digital cameras are much more convenient than film cameras. You can instantly see how the picture will look from the LCD screen on the back. If your picture doesn't turn out okay, you can simply delete it and try again. You can't do that with a film camera. Digital cameras mean photographers can be more creative and experimental. Photo by John L. Beeman courtesy of the US Navy. Digital cameras look very much like ordinary film cameras but they work in a completely different way. When you press the button to take a photograph with a digital camera, an aperture opens at the front of the camera and light streams in through the lens. From this point on, however, everything is different. There is no film in a digital camera. Instead, there is a piece of electronic equipment that captures the incoming light rays and turns them into electrical signals. If you’ve ever looked at a television screen close up, you will have noticed that the picture is made up of millions of tiny colored dots or squares. These are pixels too. Laptop LCD computer screens also make up their images using pixels, although they are often much too small to see. In a television or computer screen, electronic equipment switches all these colored pixels on and off very quickly. Light from the screen travels out to your eyes and your brain is fooled into see a large, moving picture. In a digital camera, exactly the opposite happens. Light from the thing you are photographing zooms into the camera lens. This incoming “picture” hits the CCD, which breaks it up into millions of pixels. The CCD measures the color and brightness of each pixel and stores it as a number. Your digital photograph is effectively an enormously long string of numbers describing the exact details of each pixel it contains. You can read more about how a CCD produces a digital photograph in our separate article on how CCDs work. |
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