How to create this?

1. Choose the picture, file > open > picture.
2. Right click >Duplicate layer
3. Click above the eye icon to hide the layer, then select the first layer
4. Go to  image > adjustment >black and white
5. Then visible the second layer (click the box eye icon are)
6. Select the eraser tool, erase the color you don't want....
7. Walaaaaaa