This talk is about easy ways to reduce image sizes without compromising quality using open-source command-line tools you can easily automate. About 50% of the average web page is images, so by focusing on images, you have an excellent opportunity to improve page performance and user experience. You can save 20-30% of your bandwidth bill and improve response time with little or no code changes and your site will still look just as good.
* GIF vs PNG
* Truecolor PNG
* IE6 and transparency
* AlphaImageLoader and performance
* Optimizing PHP/GD-generated images, favicons, CSS sprites