Rainbow
Creates different rainbow gradients.

Beam

Linear

Radial

   

Curl

Twirl

Angle

Horizontal Bow

Vertical Bow

Overlay blend mode

 

Preview Cross Right click (Windows) or hold the Ctrl key and click (Mac) on the preview to set the center of the effect. For the Linear effect you have to use the preview cross to change the angle and density of the linear rainbow gradient.
Angle Slider Lets you rotate the rainbow color 360 degrees around.
Multiply Slider Adjusts the density of the effect e.g. a value of four means that the effect consists of 4 rainbow gradients.
Red / Green / Blue Sliders If each of these three sliders has a value of 255, the rainbow effect uses the full color spectrum. Decreasing these slider values, will remove color components from the rainbow effect.
Shift Check Box Lets you move the rainbow colors.