This effect allows to create a multi-colored glow of any image color. 
This effect allows to create a multi-colored glow of any image color.
Controls
Glow Light
The color, which is necessary to make glow, is set in color pad.
Tolerance scale sets which of the nearest to the chosen color have to glow. Parameter accepts value from 0 up to 1. At a parameter value equal 0, only given color will glow, and at a value equal 1 - almost all image colors.
Gradient line allows to set a multi-colored glow with smooth color transitions. On the left slider on a gradient line the original glowing color is displayed and on the right - final glowing color. You can set six intermediate colors maximum between original and final colors.
Advanced
Radius scale sets glow radius in pixels. Glow radius accepts values from 0 up to 300 pixels.
Brightness scale sets glow brightness. Parameter accepts value from 0 up to 2.
Keep glow scale sets how much glowing color should remain not glowed. Parameter accepts values from 0 up to 1. At a parameter value equal 0, glowing color will be glowed completely and at a parameter value equal 1 - remains not glowed.
Brightness only tag allows to switch between two glowing regimes: maximum brightened glow and average brightened glow. If you set a tag in this checkbox you will get maximum brightened glow, i.e. luminescence ray, set by gradient line, will be seen only when background layer is darker than ray. Without tag ray will be seen any background.