If you want Designers to start using this, then we need a photoshop plugin, an illustrator plugin, a Sketch plugin, a pixelmator plugin. Make it easier for us to export images as a .BGP. If the images are truly smaller without affecting the current user experience of users using mostly modern web browsers, then we're more likely to pick up on using this.
No you don't. You export it as png or whatever lossless format you can and your job here is pretty much done. Then technical guys you are working with convert it or write a script to convert it automatically on upload/download on their website or do whatever they need to do to get lossy image for whatever purposes.
Still, to become truly widespread you need to have support in all kinds of software out there, "everything you need is js plugin" is unreasonable optimism in my opinion. And, anyway, decoding using js isn't fast enough to be one and only solution forever, you need to get to have browser and other software support sooner or later, and for that you need 1 standardized format, not "whatever your plugin supports" as thread-starter suggests.
For the Photoshop file-format plugin, someone should contract out to Toby Thain at Telegraphics who has written a bunch of file format plugins. Or optionally use his GPL'd source code as a starting point if you want to DIY:
What if I use this: http://getbootstrap.com/examples/starter-template/ and add an img tag with a src to a .bgp? Will it render when I refresh the browser? I see that the BPG images are decoded in your browser with a small Javascript decoder. So a JS file is referenced in the HTML, and everything will run ok when I refresh? That's the promise?
