Dithering was never a compression technique, it's a filtering technique for reducing banding on devices/displays/images that have a small color palette.<p>In fact, even in the 80's, dithered images were often <i>larger</i> than their un-dithered counterpart, sometimes by a lot. But it was worth the trade-off when the alternative was an image with so much banding that it could be confused for a European flag.<p>Unless you're trying to display your image on a retro console (or have aesthetic reasons for wanting to achieve that effect), you should not use dithering. Essentially all modern devices have a sufficiently enormous color palette, and modern compression algorithms use other techniques to achieve their efficiency.<p>In fact, modern compression will do a much better job giving you a smaller file size if you <i>don't</i> use dithering.<p>Edit:<p>Don't get me wrong, dithering is a <i>super</i> interesting topic, and designing a good dither can be surprisingly hard, it's just not going to help you if your goal is to shrink the images on your website the way the article claims.<p>If you haven't seen the trailer for "Return of the Obra Dinn" you owe it to yourself to take a look:<p><a href="https://youtu.be/ILolesm8kFY" rel="nofollow">https://youtu.be/ILolesm8kFY</a><p>Super cool aesthetic, and writing that shader must have been all sorts of difficult/fun. But you don't do this sort of thing for compression efficiency.