ColorThis app can control color of pictures at your taste. It can change your photo's colors as much as you want.
As converting selected color to black and white, you can make your photo look cool like movie poster.
Just move your finger, it will change from black and white to original color or change from original color to black and white.
- Share your edited images on Facebook,Twitter or email.
- Choose from 2 different brushes (hard or soft edged).
- Save original size image.
AutoSketch+ 
WaterColor Photo 
AutoHDR 