This filter, accessible through Filters/Light Effects/Discotheque, imposes a bright disco-light effect on top of the original image. The light source is located in the center of the image.
In the "Discotheque" dialog use the sliders (or type directly into the boxes) to set the following:
Rotation rotates the disco-lights through 0 to 360 degrees.
Scale increases and decreases the intensity of the light source and therefore the extent of the light-spread across the image from the center.
Transparency determines how much of the image is visible. A transparency of 0% causes the image to be not visible at all, with the disco-lights more or less the only thing visible, depending on the scale setting; at 100% the image is totally visible, with the disco-lights superimposed.
The changes you make are immediately displayed in the Preview box.
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