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Radial Blur Plugin

The Radial Blur plugin

The Radial Blur plugin draws a source blurred along lines from the center of the image out toward the edges.

The plugin works by drawing the source image on top of itself multiple times. Each pass is slightly larger (or smaller) than the previous pass, and slightly more (or less) transparent. Each pass may also be offset slightly from the previous ones to make the blur proceed left to right, or up & down.

Settings

The Radial Blur plugin has a number of control values which alter the look of the blur.

Center X / Y

These parameters alter the origin of the blurring. The default (0, 0) is the center of the image.

Blur Distance

This parameter controls how long the blur streaks will be by controlling how much the image will expand or contract over the number of passes. Larger values mean more blurring, but may require more blur passes to avoid visible "steps" in the image.

Blur Passes

This parameter controls the number of times the image is drawn. More passes makes a better quality blur, but consumes more render time. If you have an older video card, reducing this number may help improve performance.

Alpha Start / End

These parameters control the initial and final transparency values of the blur passes. The default settings draw 8 blur passes, starting with an opacity of 25%, falling to an opacity of 0%, or completely transparent. In general, one of the values should be zero, but you can get some cool results by experimenting with others.

Alpha Mode

This value controls whether the blur passes are blended with the display, or added to it. Blending will tend to preserve the overall brightness of the image, while adding will make the image much brighter where the streaks overlap bright pixels on the original image.