As shown in the picture, how to turn the sky P into a gradual cyan?

1. Use the lock tool to frame the sky above the tree (make a good choice).

2. Feather a few pixels, and I chose 7 (to adjust the color of the face and blur the lower edge).

3.CTRL+U？ (color matching, just pull a lesbian and change it to blue, don't change too much. )

Ok, the basic simple color matching can be done in 1 minute.