I've found my project source code. Can share it with you. It uses some non-trivial scaling algorythm (can't remember the link to the original publication about this resampling), which produces good quality. I've tried to port all math to worker but haven't it done yet. If it can help, I could easily join your project and share codebase. I've got some marketing ideas and I know where to grab some traffic and how to set up monetization. If it's interested, touch me via e-mail or in Skype: vladimir.ignatyev