At imgix, we are building the "graphics card" for the Internet. We provide image and visual media processing on-demand via a URL-based API. We connect to a customer's existing images (e.g. S3 bucket) and then provide a domain they can use to access those images dynamically, creating any number of sizes, crops, adjustments, and other variants of those images. Think of it like Photoshop's "Save for Web" feature but for a million images at a time.