What is the best Core Image filter to produce black and white effects?

Question

I am using Core Image and would like to produce a black and white effect on the chosen image.

Ideally I would like to have access to the same sort of options that a

Answer 1

With regard to the answers suggesting to use CIColorMonochrome: There now are a few dedicated grayscale filters available from iOS7 (and OS X 10.9):

• CIPhotoEffectTonal

  imitate black-and-white photography film without significantly altering contrast.

• CIPhotoEffectNoir:

  imitate black-and-white photography film with exaggerated contrast

Source: https://developer.apple.com/library/mac/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html