8-BIT COLOR JUST AS FEW BOOKS CONTAIN ALL POSSIBLE WORDS, FEW IMAGES CONTAIN ALL 16,777,216 COLORS POSSIBLE WITH 24 BITS. FOR IMAGES WITH RELATIVELY FEW COLORS (<257), WE CAN: MAKE A LIST OF THE 24-BIT COLORS THAT DO OCCUR (CALLED THE PALETTE). USE ONE 8-BIT NUMBER FOR EACH PIXEL THAT SPECIFIES THE POSITION OF THE PIXEL'S COLOR IN THE LIST OF 24-BIT COLORS. THIS IS HOW 8-BIT MACHINES AND .GIF FILES WORK

The Web: Technologies and Techniques Links to other course pages: CS 105 Home Page CS 105 Lecture Schedule CS 105 On-line Discussion Group: All discussions Discussion relating to this lecture topic Williams College Department of Computer Science

This page is part of a section of lecture slides related to " Why GIF? Why JPEG? " within the topic "Using and Understanding Digital Images". Other slides within this section and other sections of slides for the topic "Using and Understanding Digital Images" can be accessed using the links below. Basics of HTML Image Tags Images Digital Images DIGITAL IMAGES PAINT BY NUMBER DIVIDING INTO PIXELS SAMPLING WITHIN PIXELS PIXEL RESOLUTION Why GIF? Why JPEG? "RGB" COLOR WHY 255? 24-BIT COLOR A STATISTICAL ANALYSIS OF "GREEN EGGS AND HAM" KEEPING THE DIGITS IN DIGITAL LOW-FAT EGGS AND HAM 8-BIT COLOR 8-BIT VS. 24-BIT "LOSSLESS" COMPRESSION TECHNIQUES "LOSSY" COMPRESSION HTML Color and Image Options SNOW "FFFFFF" AND BASIC "000000" HTML COLOR ATTRIBUTES OPTIONAL ESSENTIALS VERTICAL IMAGE ALIGNMENT HORIZONTAL IMAGE ALIGNMENT LINE BREAKS