Computer Science 1033A/B Lecture Notes - Lecture 2: Video Card, Octal, Cmyk Color Model

• School: Western University
• Department: Computer Science
• Course: Computer Science 1033A/B
• Professor: Laura Reid

Document Summary

We rely on images for information, explanations, entertainment. Graphics originate from: non-digital medium (paper copy of a photo), outside world, create image. Computers only understand/speak binary (digits 0 and 1) convert all words, images, etc. to 0 and 1. On screen: measurement system binary system (base of 2, exponent = number of bits, byte: collection of 8 bits (2 possible combinations of 1s and 0s. Ex: 21 = 2 values (0, 1), 22 = 4 values (00, 01, 10, 11): binary (2 binary digits/ bits) 0,1,10,11,100,101, 111,1000: octal (8 digits or think of it as 8 number values) Coding colors: black/white = 1 bit only (0 = black, 1 = white, 2 bits combination of black and white (01/10) grey, more bits, more shades 4 bits 24 = 16 grey shades. Added light to a black background in order to obtain color shades. In true color each pixel represents some color shade uses 24 bit representation =