tomtaylor/satellite-eyes — pull request #11 by bobthecow (2013-01-26 19:16:09+00:00)
Title: Image Effectastic.

Because how awesome is this?

![stamen-watercolor-desaturated](https://f.cloud.github.com/assets/53660/100109/a0947cac-67ec-11e2-8c7f-4462d92fc614.png)

* Store image effect definitions in NSUserDefaults, allowing user overrides and easier definition.
* Image effects define an array of filters, allowing filter composition.
* Add a "desaturate" image effect.
* Use a new defaults key (selectedImageEffectId) since the old key was an integer.
* Use an affine clamp before applying filters (so that gaussian blur and gloom type filters don't look awful).