

Got to File/automate/photomerge.
This is what you get:

Click on right half of photo...a red border appears.
Click on perspective box (in settings), the image
adjusts itself to parallel the perspective.

Almost done. There is still one one more thing
to do. Go to free transform:perspective and bring
the right corner down till the perspective is visually correct.
Click the move tool to apply transformation.

Great photo! for fun, you can use the paint bucket tool
with the color of your choice and fill in the blank space.
