Jessica Tate, senior user experience designer at Portland’s ThinkShout gave a very good presentation at Devsigner entitled “Everything You Ever Wanted To Know About Images”.
On the outside, images on the web seem simple: save an image, compress it, and upload it to a website. If only it were that easy. What file type do I use? What size compression (or k-weight) should I aim for? What way is the “proper” way to save an image for the web? Are there different rules for images in Drupal and WordPress? If you’ve asked yourself any one of these questions, then this is the perfect session for you.
We will begin by setting a baseline for image standards and the basics of images as applied to the web. We will explore guidelines and practical applications of saving images for web optimization, image file types, and what they are best used for from a technical perspective.
Here’s a link to her slide deck which is packed with great information.