COSC 109 Lecture Notes - Dither, Color Balance, Gif
31 Jan 2014
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Cosc 109 chapter 3: capturing and editing digital images. There are 4 different types of scanner: flatbed, sheet-fed, handheld, drum. There are 3 different types of scanner resolutions: optical, enhanced, reported in dpi (dots per inch) How scanners work: flatbed scanners have a moving scan head that has a row of light sensors. When scanning you also need a sampling rate: sampling in x-direction: number of sensors available in the row, sampling in y-direction: discrete stepwise movement of the scan head. When you are determining scanning resolution you need to think about how the scanned image is going to be used. Is it going to be printed or web/ on screen display: print. Requirement of the printing device (resolution: web or on-screen display. With digital cameras you just point and shoot and it captures the image: d-slr (digital single-lens reflex) Most d-slr cameras use interchangeable-lenses: there are 2 digital camera sensors.
