Format
filter(type="angular_blur", ...)
Args
x: Horizontal center of effect, in pixels, relative to image centery: Vertical center of effect, in pixels, relative to image centersize: Amount of blur (defaults to 1)offset: Pixel radius before blurring occurs
Blurs the image by a certain amount in a circular formation, as if the image is spinning. The size of the blur can roughly be thought of in “degrees” worth of blur. As the distance from the center increases, the blur becomes more noticeable since the same amount of angular motion has to travel farther along a circle.
Typically this blur is used with an entire plane, but it could be used to give a sense of motion blur to a spinning object.
Note
Large blurs will look worse toward the edges due to limited sampling. Loss of accuracy will appear where
size× distance is greater than about 300. You can increase accuracy by breaking up large sizes into multiple filter passes with differing sizes. The blur used is Gaussian, so combining blur sizes A and B will give a total size of sqrt(A2+B2).
The offset parameter, if used, is effectively subtracted from the pixel distance to the center. Pixels within that radius won’t blur. Anything outside that radius will act as if it’s offset pixels closer to the center.