[Pixel Bender] Bright Pass filter

I’m pretty sure you already heard about pixel bender, if not check Adobe’s  or Lee Brimelow’s website for awsome tutorials. 
Today I gonna share with you, my first pixel bender code ever, which is a bright pass filter. This filter set the dark pixels to black according a threshold value for the ‘darkness’.

<languageVersion : 1.0;>

kernel BrightPassFilter
< namespace [...]