Editing photos : 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.