How to invert an image:
Inverting an image is really simple in Photoshop. It is basically just a one step process using the Invert Adjustment filter.
1. First open the image your image in Photoshop.
2. Then click the Invert Adjustment Layer button info Adjustments Panel. That's it!
Here is the final result:
2. Then click the Invert Adjustment Layer button info Adjustments Panel. That's it!
Here is the final result:
Step 1: 
Final:
Final: