LearnBoost/node-canvas — pull request #309 by danielbeardsley (2013-07-30 10:19:22+00:00)
Title: JPEGStream: add progressive mode option

Progressive jpegs have several very useful advantages over baseline
jpegs:

* Slightly smaller for the same quality (3-7%)
* Load much faster in most browsers.

This adds the `options.progressive` option to the
canvas.jpegCreateStream() function.