Nice idea. I'd recommend implementing a demo image on the site. Not everybody will go through the trouble of uploading their own file to test out the project.

Yeah, once upon a time I had an idea of having a drop-down menu which would have four or five sample images you could select from to instantly load them into place. I can't remember why I didn't end up implementing that. But unless a new client drops out of the sky in the next few days, I'm going to have some spare time later this month, so perhaps I'll take your comment as motivation to hack that into place. :)

Very nice! I was thinking of adding something akin to this as well, at least in terms of image dithering. :)

But I'm still torn as the well behaved python programmer in me wants to add pillow as a dependency for that and the not so well behaved one wants *0* dependencies. I think I'll add it as an extra-dep when get around to it.

Yeah, I get it - I made a point of building this with no jQuery or other JS dependencies just for more experience in writing "pure" vanilla JS. But of course one of the ways I can get away with that is that the browser already gives me a huge "standard library" of sorts for doing hard things like reading compressed image formats…

Though python has a massive set of "included batteries", simple images aren't included in those. This makes me very sad sometimes and I usually just fall back to simple BMP files... :/