Recently I’ve been playing around with the Nintendo DS web browser. One of my discoveries was that it automatically resizes any image beyond a certain width (768px), height (768px), or dimension (307200 sq. px).
To show the actual image sizes this allows, I’ve created this handy SVG file. Easy numbers to remember are displayed, though anything that does not extend the curved line at the bottom right will work too. Additionally, this page shows all numerical options.
How is this useful? Well, the resizing isn’t too big a deal for most photographs, but if you have larger images with text on them (comics for example), they will look pretty ugly and become hard if not impossible to read. So if you care at all about your DS browsing public, you can use this information to keep your images within these limits.