Photoshop: Selective Color

In this tutorial you will learn how to keep certain objects colored while turning the rest of the image black and white.
Final result:

1. Open the image. I used this image:
2. Go to Layer > New Adjustment Layer > Black & White.
   Press OK twice.
3. Now you have to select the parts of the image that you want to keep colored. I wanted to keep the color of the butterfly and I used the pen tool to select it, but you can use any method.
4. Fill the selection with black.
5. If there are any mistakes where the color has gotten outside of the object or if the object has been turned black and white you can correct that. Grab the brush tool and paint the areas that you want to colorize with black. Paint the areas that you want to turn black and white with white.
   

You're done! Final result: