Spin Blur

This transformation creates a blurred version of the current image that simulates rotating the camera while taking a time exposure. This effect differs a little from what you get using an actual camera in that the corners of the image are lacking adjacent pixels to blur with, and are therefore blurred less than the center of the image.

Spin Blur displays a small cross overlayed on the input image to show the center of rotation. By default this control point located at the center of the input image, but you can drag it to any location you wish.

Amount

The amount control lets you control how much of the blur transformation is applied to the input image. You can apply a percentage of the transformation to the entire image, or you can specify an amount mask to restrict the effects of the transformation to only part of the input image.

Blur Angle

This slider lets you choose the rotation angle over which pixels are blurred, in degrees.

Step Size

This slider controls how smooth the blurring is - at 0% it is very smooth and as you increase the step size the rotation is done in regular steps.