Another aspect of image optimization that I'm aware of, but haven't even bothered with yet, is handling the art direction problem of responsive images.
Like "pan and scan" conversions of widescreen movies to the old 4:3 TV size, if you're serving a narrower image to mobile devices than say a desktop browser, the ideal image to serve is probably not a generic resize, or center-cropped version of the image. Mozilla has a nice page on responsive images that explains it better than I could: https://developer.mozilla.org/en-US/docs/Web/HTML/Guides/Res...
Another aspect of image optimization that I'm aware of, but haven't even bothered with yet, is handling the art direction problem of responsive images.
Like "pan and scan" conversions of widescreen movies to the old 4:3 TV size, if you're serving a narrower image to mobile devices than say a desktop browser, the ideal image to serve is probably not a generic resize, or center-cropped version of the image. Mozilla has a nice page on responsive images that explains it better than I could: https://developer.mozilla.org/en-US/docs/Web/HTML/Guides/Res...