I’m a big fan of Irfanview. It’s one of the best examples of how I think all software should be: small, light and with just the right features. I use it every day, and can’t recommend it enough. But Irfanview isn’t perfect. It applies the default worst icon I’ve ever seen to your images, but more importantly it’s not very good at optimizing images for the web. JPEGs saved from Irfanview were consistently worse in both quality and file size compared to the same saved through Photoshop’s ‘save for web’ feature. That’s where RIOT comes in.
More RIOT: Save optimized web images from Irfanview