Getting a Black and White UIImage (Not Grayscale)

Question

I need to get a pure black and white UIImage from another UIImage (not grayscale). Anyone can help me?

Thanks for reading.

EDITED:

Here

Answer 1

If what you're looking for is to threshold the image -- everything brighter than a certain value turns white, everything darker turns black, and you pick the value -- then a library like GPU Image will work for you.