Photoshop - Focusing using decoloration

This lesson will learn you an easy trick to decolorise everything on picture except one person. Very effective way to put focus on one person.

1. Open your picture

2. Use your brush tool, and select Color mode, with parameters as noted bellow:

3. With your brush tool, color (decolorise) every part of the picture you want to decolorise (while you use your brush, it should translate all colors to shades of gray). I wanted to put focus on person in yellow dress, so i got these results:

SOURCE