There are many different techniques and ways of creating a selective color images in Photoshop, let me show you the one where we use the black & white adjustment layer.
DOF or Depth Of Field is a commonly used technique in photography where you can precisely focus only part of the face or object you are taking shot of. Let's recreate this using Photoshop.
Let's create that simplified black and white effect on a photo using threshold adjustment and make a so called Internet meme or a motivational poster ready to be printed on an A4 size paper.