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Digital Imaging Explained
Digital Imaging is a process where an electronic photograph, scanned document, or image is converted into a series of electronic dots called pixels. Pixels is an acronym for "picture elements". After the image is converted, or digitized, it is stored on a memory storage device which may be a hard drive or some sort of electronic storage device such as a memory stick. The pixels are stored in a compressed format to save storage space. As each pixel is being created it is assigned a color value, called a tonal value, of black, white, shades of grey, or an actual color. These pixels must be processed by a piece of software in order for them to be called up and viewed as an actual image later. Traditional cameras capture images onto film while digital cameras use an electronic chip known as a Charged Coupling Device (CCD). The CCD is actually a grid of miniature light-sensitive diodes. These diodes convert photons (light) that strikes them into electrons (electrical impulses). The technical name for these diodes is 'photosite'. The brighter the light is that hits the photosite the stronger the electrical charge is that's produced. After converting the photons into electrons, a mini-computer, located inside of the camera, reads the stored electrical value in each photograph. Then a built-in analog-to-digital converter turns the stored electrical value into a digital value. These digital values are then stored on the cameras memory storage device. When these digital values are recalled by software, and displayed on a screen, they reproduce the image that was originally captured by the camera or digital input device. The digital image that is created by the CCD is huge. It's far too big to be easily stored in the relatively little amount of storage space that's available to a digital camera. Accordingly, the camera's computer compresses the image to make it smaller. There are two basic methods for achieving this compression. The first method takes advantage of repetitive patterns in the image. For example, if you are taking a picture of an airplane that is flying in the sky, a lot of the picture will be a chunk of blue sky. The camera recognizes that there are multiple parts of the image containing the same digital information, so it only records a small piece of the sky. Then it simply creates a map to tell it where the rest of the sky belongs. When the picture is ultimately displayed the sky appears exactly the same as it did in the original image when it was first captured. The only difference is that the overall storage requirements were reduced thanks to the camera's clever mapping techniques. The other method uses a procedure called irrelevancy. This methodology automatically removes digital information that is not visible to the human eye such an infra red light. Digital imaging is amazing yet we have only started witnessing the revolutionary changes that are yet to come. About The Author Warren Lynch has been shooting commercial photography since 1979. Clients include Several Regional and National accounts. Sign up for"The Digital Dose" and receive his tips every other week for FREE! http://www.photopheed.com.
MORE RESOURCES: The Face Magazine: Culture Shift review – rebellious fashion photography with a raucous sense of fun The Guardian Tale of Two Weegees at the International Center of Photography National Review The Street Photographer Who Captured New York’s Fabulous Unknowns The New York Times Meet the duo using hair and photography as a medium to consider Africa and the African diaspora Wallpaper* Is Photography Actually an Art Form? The Phoblographer Ethical Photo Editing: Maintaining Integrity in Yearbook Photography Walsworth Yearbooks Gallery to open annual photography show Bowie News - McBroom Wins Grand Champion at San Antonio Stock Show and Rodeo Photography Contest The Fayette County Record Works by Armineh Johannes Part of Chelsea Int’l Photography Competition The Armenian Mirror-Spectator Canadian Citizen Xiao Guang Pan Charged with Unauthorized Drone Photography of Cape Canaveral Defense Installations The Maine Wire Rania Matar’s “SHE” explores women’s resilience in new Middlebury Museum of Art photography exhibit The Middlebury Campus Photo Focus: The magic of photography Charleston City Paper Axel’s Shoot Out salutes three Vermont photographers Waterbury Roundabout Echoes of Beijing: Liu Shiming’s Sculptures and Lois Conner’s Photography in Dialogue, NYC Arte Fuse New photography exhibition launched at Stonehenge Yahoo News UK Grosby Group Celebrates 27 Years Covering the Academy Awards: A Legacy of Iconic Photography EIN News Ron Rosenstock remains in the picture at JCC Art Gallery, will be celebrated at gala - Worcester Mag Beyond the lens: S&T’s student photographer looks to the future Missouri S&T News and Research Photography Exhibit Chronicles Pandemic Time on the Island The Vineyard Gazette - Martha's Vineyard News Recovery and connection through art Homer News Minimalist Winter Photography Fstoppers Asheville photographer named 2024 Photographer of the Year, work displayed in Times Square Citizen Times Detroit photographer opens historical hip-hop exhibit Oakland Press John Blakemore obituary The Guardian Will Douglas photographs the Brentford Penguins – the football club that turns no child away It's Nice That Local Photographer Wins Major Award For Photos In East Palestine Wheeling Intelligencer Photos That Capture the Soul of San Francisco The New York Times 23 local artists recognized for their work during annual contest; reception is Saturday Times Reporter Are Photography Festivals Still Worth Your Time? The Phoblographer Documenting Black Seaside – past and present – has become a passion for one photographer. Monterey County Weekly After 15 Years, I Finally Got My Vision Back. Here’s How It’s Affecting My Photography The Phoblographer iPhone 16e specs show it’s missing 3 key camera features – including the latest Photographic Styles TechRadar B&H Photo Announces Bild Expo 2025 - A Two-Day Celebration of Photography, Content Creation, and Filmmaking PR Newswire The roots of American photography are firmly in Cincinnati, new documentary declares The Cincinnati Enquirer Through the Lens: Student Photographers on Campus The Dartmouth Photographers Stay Rooted At YUAG New Haven Independent Black and Baroque: The story of She Shoots 317 photography Indianapolis Recorder Paul McCartney announces Beverly Hills photography exhibit The Music Universe. What makes Bloomington unique? These European photographers plan to capture it on film. The Herald-Times Black history reimagined through a photographer’s lens BayStateBanner This photographer just broke the world record for the most headshots taken in an hour. Can you guess how many he captured? Digital Camera World A' Camera and Photography Equipment Design Award Announces Comprehensive Prize Package for 2024 EIN News ‘I want my photos’: Local bride in battle with photographer to get wedding pictures - Boston 25 News Designer Priya Ahluwalia and photographer Nick Sethi talk about their creative process and the need to innovate Harpers Bazaar India Hannibal Arts Council exhibits opening Feb. 28 feature photography, graphite drawings, oil and acrylic paintings Muddy River News Personal Focus: Former Southern Living photographers show their favorite images at Aldridge Gardens Over the Mountain Journal The American Dream, Through Foreign Eyes The New York Times 9th Xposure photography festival gets under way in Sharjah, UAE Digital Camera World "My images tell a story of art, science and culture all in one frame," says astrophotographer Josh Dury Digital Camera World BG Arts Council seeks entries for ‘Perspective: Photographers of NW Ohio’ BG Independent News How Huntsville-native + photographer Miles Whitmore is changing the creative scene in Huntsville Hville Blast |
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