A JPEG Encoder for JavaScript
It might seem a crazy idea to implement a jpeg encoder in JavaScript and in fact, it is! I did it because of another little project of mine, which is about a way to support alpha-transparency in jpeg images (using basically two images: a normal jpeg and a greyscale mask). I wanted to code a tool to create these images with Appcelerator Titanium, but I had a problem: You can create a jpeg with the getImageData canvas method, but currently the quality option is not working. This was very annoying, because the tool was all about optimized the file size. So the tool was useless without proper jpeg encoding. I searched for jpeg encoders for Python, Ruby or PHP, but there weren’t any! They all rely on external platform specific libraries. Then I remembered that there was an ActionScript 3 based jpeg encoder floating around and I decided to try to port it to JavaScript.
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