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Elated Communications: Understanding Image Formats
This tutorial looks at the three common image formats used on the web: GIF, JPEG and PNG. You'll learn how these image formats work, and where to use each type of image in your web pages.
Khan Academy
Khan Academy: Lossless Bit Compression
Computers represent all data in binary, so all types of files, from text to images to videos, are ultimately sequences of bits. Regardless of whether the bits represent a document or a GIF, computers can use a bit compression technique...
Khan Academy
Khan Academy: How Can Computers Reduce File Size?
Reducing the file size using Lossless and Lossy for file compression.