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Digital Photography
By Mike Volker
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What is Digital Photography?
• A form of Photography that uses digital technology to make images of subjects
• Replaced film
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UsageCan be displayedPrintedStoredManipulatedTransmittedArchived
All without chemical processing
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How do I digitize an image?Scanning a conventional image to the
computerScanning 35 mm Slides to the computerMoving to the computer from a memory
cardCopying from a Web Site
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Digital and Analog SystemsDigital is a system that uses discrete
(discontinuous) valuesNon-digital (analog) uses a continuous
range of valuesDefinition: comes from the word digit
and digitus which means finger. Used for discrete counting
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Sensors and Storage Image Sensors
Read the intensity of lightMemory Devices
Store the digital image information Nearly all digital cameras use built-in
and /or removable solid state flash memory
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Quality of ImagesPixel Count (megapixels)Lens QualityCapture medium – CMOS, CCD, FilmCapture format
RAW, TIFF, JPEG, etc. (digital) 135 film, 120 film, 5x4, 10x8 (film)
Processing Digital and or chemical processing of
negative and print
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Pixel CountsNumber of pixels for a given maximum
resolution Product n = w x h
Image 1600 x 1200 Yields 1.92 megapixels (192,000 pixels)
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Presidential Portrait First official U.S.
Presidential Portrait to be taken with a digital camera.
Majority of Professional news photographers use digital cameras
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Usage of photographsSnapshot PhotographersCell Phones (inferior images)EmailWorld Wide Web (www)Digital picture framesCourt proceedings