Use the Smooth Rotation tool to adjust an image's angle of rotation. For example, use Smooth Rotation when viewing a CR Spine to straighten the spine.
To adjust the angle of rotation
From the Image area top toolbar, Geometry button menu, select Smooth Rotation.
Click one end of the angle to straighten.
Move the pointer along the angle.
As you move the pointer, a line is drawn. The current angle is displayed above the line.
To set the angle, click again.
The image is rotated such that the drawn line is perfectly vertical. The image is centered automatically. A rotation symbol appears to the right of the image.