GRA 323 Lecture Notes - Lecture 3: Digital Photography, Stock Photography, Lossless Compression

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Three ways to digitize: scanning, digital photography and image banks. Was standard when cameras did not exist. There are two types of scanning: drum and flatbed. Variables for ability (resolution/interpretation, ccd"s/sizing, copy, pixel depth, dynamic, software) Reflective art (light reflects off the art into sensors then scanned; ex. photos) Transparent art (light goes through the transparent object then scanned; ex. slides) Flatbed scanners use interpolation which creates additional pixels by faking them which doesn"t increase the quality of the photo. Charged-coupled device (ccd) are sensors that capture image detail. *max. resolution = ccd #/width of original (bed)* Pixel depth is the amount of information held by a pixel. 4-bit scanners can see all 2 shades = 16 variations) Rgb scan (3 channels) would have 8-bits of colour. R= 2 x g= 2 x b= 2 = 16. 6 million colours. The higher the dynamic range, the better the greys look.

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