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Lecture 3

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Graphic Communications
GRA 323
Diana Brown

th Image Capture (September 19 , 2013) - three ways to digitize: scanning, digital photography and image banks  Scanning - was standard when cameras did not exist - used today for niche, specialty markets - there are two types of scanning: drum and flatbed *uses light* - 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) *scanners use RGB colours* - 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 - CCD results in higher resolution *max. resolution = CCD #/width of original (bed)* - 8-bit capture for photos/images - pixel depth is the amount of information held by a pixel - not all scanners are alike (ex. 4-bit scanners can see all 2⁴ shades = 16 variations) - RGB scan (3 channels) would have 8-bits of colour R= 2⁸ x G= 2⁸ x B= 2⁸= 16.6 million colours *vectors scanned at 1-bit at 1200 DPI
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