Straightening
Straightening lets you correct tilted horizons or apply a creative tilt to your photos.
To straighten a photo
1	Select the 
Straighten tool 

 from the AfterShot Pro toolbar or press 
S.
 2	Drag in the Preview panel to draw a horizontal or vertical line that you want to use as a reference for straightening the photo.
3	Release the mouse button to apply the changes.
The Straighten tool lets you choose a reference point (emphasized above by a red line) for straightening
Note: When you straighten a photo, the photo is not cropped automatically, so you will see white areas along the edges of the photo.