Polar

To create Polar effect, click Deformation | Polar or select Polar folder.

By Choosing  Inverse, you can flip the image referring to the vertical line of symmetry.

By Choosing  Backwards,  you can flip the image referring to the horizontal line of symmetry.

By Changing  the Angle value you can turn the image on given angle.

By Sliding the Value scroll box you are squeezing the image from the corners toward the center.    

Tip

This effect gives a view of the image as if  you are standing on the on North Pole and looking down.