title: What is the best Core Image filter to produce black and white effects?
body: <p>I am using Core Image and would like to produce a black and white effect on the chosen image. </p>
  
  <p>Ideally I would like to have access to the same sort of options that are available on Photoshop i.e. Reds, Cyan, Greens, Blues and Magenta. The goal being to create different types of the black and white effect.</p>
  
  <p>Does anyone know what filter would be best to manipulate these sort of options? If not does anyone know of a good approach to creating the black and white effect using other filters?</p>
  
  <p>Thanks</p>
  
  <p>Oliver</p>