EECS 1520 Lecture Notes - Lecture 14: Bit Rate, Joint Photographic Experts Group, Lossless Compression

• School: York University
• Department: Electrical Engineering and Computer Science
• Course: EECS 1520
• Professor: Andriy Pavlovych

Document Summary

Representing colour: colour is typically represented using the rgb colour model, three integers (in the range of 0-255) describe the amount of red, green, and blue required to reproduce the colour. 128, 0, 128 red orange green purple: other colour models include, cyan, magenta, yellow, and black (cmyk) -colour printers, hue, saturation and luminance (hsl, luminance, blue, red (yuv) Raster graphics: an image that is comprised of a matrix of pixels. Images created/edited using painting applications: very good for photos, but suffers from pixelation, when enlarged, the rectangular shape of pixels becomes apparent. Indexed colour: popular technique for compressing images, similar to compressing text with keyword encoding, but with colours instead. Instead of representing all colours, save only those used. Guide to choosing image format: google has an excellent guide, aimed at developers. Image from prof. amir h chinaei digital media lecture-slide 24.