Data Representation Represent! How information is stored in a Computer System With our resident Binary enthusiast … Brian Sup Homies! only 10 people understand binary Mr McAlpine Hamilton Grammar School
Saves attributes of objects rather than all pixels – less memory requirements
Resolution Independence – prints at the full resolution available on printer
Can edit all the individual objects which make up the graphic, but not the individual pixels
Backing Storage Requirements This image of screech measures 2 inches by 2 inches. It has a resolution of 80 dpi using 256 colours Memory Required Total Pixels (2 * 80) * (2 * 80) = 25, 600 Each pixel could be one of 256 different colours 256 requires 8 bits 25,600 * 8 = 204, 800 bits 204, 800 = 25,600 bytes or 25 kilobytes
Your Turn This idiots picture measures 3 inches by 2 inches It has a resolution of 150 dots per inch. It uses TRUE COLOUR which uses 24 bits per pixel 395.5 Kilobytes Worksheet 4
Data Representation The need for Compression Different methods of Compression Compress Yourself!