"In this DiW article, you will learn some tasty ways to include image-attachment information in your posts. From echoing the latest image path to displaying custom-sized image-links for all post attachments, this article should serve as an invaluable resource for anyone working with WordPress’ Media Library and its media-attachment functionality."

"The goal here is a background image on a website that covers the entire browser window at all times."

A quick and simple image placeholder service.

Custom Header is a theme feature introduced with Version 2.1. Custom header is an image that is chosen as the representative image in the theme top header section.

Post Thumbnail is a theme feature introduced with Version 2.9. Thumbnail is an image that is chosen as the representative image for Posts, Pages or Custom Post Types. The display of this images is up to the theme. This is especially useful for "magazine-style" themes where each post has an image.

"Post Formats is a theme feature introduced with Version 3.1. In short, with a theme that supports Post Formats, a blogger can change how each post looks by choosing a Post Format from a radio-button list."

"Placeholder Images for every case. Webdesign or Print. It's simple and absolutely free!"

"The content driven approach to fixing this is to decide which image to load based on whether the image will be stretched beyond its true pixel width. If you stretch an image beyond its true width it begins to look pixelated or blurry. In this scenario, we want to load in a higher resolution version of the image."

"The goal of this technique is to deliver optimized, contextual image sizes for responsive layouts that utilize dramatically different image sizes at different resolutions. Ideally, this approach will allow developers to start with mobile-optimized images in their HTML and specify a larger size to be used for users with larger screen resolutions — without requesting both image sizes, and without UA sniffing."

"Smush.it uses optimization techniques specific to image format to remove unnecessary bytes from image files. It is a "lossless" tool, which means it optimizes the images without changing their look or visual quality."

"A lightweight browser-based image processing library." I was looking for a way to convert images to grayscale on the fly awhile back, and this would have done it for me!

"HTML resized images in Internet Explorer look like crap, unless you add the following line in IE-speciffic CSS: img { -ms-interpolation-mode: bicubic; }"