Nope. It doesn't work with ```clamp(mix(rgb, gray, 2.0) + 0.5, 0.0, 1.0)``` . Btw, Isn't that has the same effect without "saturate"?


![screen00015](https://f.cloud.github.com/assets/4582691/1319830/06c88e70-331a-11e3-8a68-ea43ff597a29.jpg)