ITP 101x Lecture Notes - Lecture 4: Lossless Compression, Gif, Joint Photographic Experts Group

• School: USC
• Department: Information Technology Program
• Course: ITP 101x
• Professor: Tom Sloper

Document Summary

Itp 101: introduction to information technology, week 2, lecture 2: software app. Make your image smaller for web or email delivery. Requires data to be removed from the image to compress the file and make it smaller by trying to remove the least important data first. Opposite of lossy since no data is lost when the file is compressed. Standard for web graphics is 72 dots per inch (dpi: transparency, able to see through parts of an image, in photoshop, you see a gray and white checkerboard, interlacing. --a process where the graphic is displayed at multiple levels of clarity, from blurry to clear. --non-interlaced images must be fully loaded before the browser displays them. --interlaced graphics appear more quickly, first fuzzy and ultimately clear. -- the image file has to define the exact color of every pixel in the image. A pixel is generally thought of as the smallest single component of a digital image.