Colorize

The Colorize group contains controls to set the coloring of the effect.
The Colorize... pop-up can be set to:
None - No coloring is performed. The colors of the source image are used. This should be used, for example, when simulating light shining through a multicolored window, or shooting out from a multicolored logotype.
One Color - With this setting, one single color can be picked and the entire effect is colorized in that color.
3-Color Gradient - Three colors (Highlights, Midtones and Shadows) can be selected.
5-Color Gradient - Five colors can be selected.

None | 3-Color Gradient

After these follow the 3-Color Gradient presets. When one of the presets is selected, the three colors are updated (Highlights, Midtones and Shadows) and then the pop-up goes back to the 3-Color Gradient mode and the colors can be tweaked.

Fire | Mars | Chemistry
Deepsea | Electric | Spirit
Aura | Heaven | Romance
Magic |  |

After these follow the 5-Color Gradient presets. When one of the presets is selected, the five colors are updated and then the pop-up menu goes back to the 5-Color Gradient mode and the colors can be tweaked.

Enlightenment | Radioaktiv | IR vision

Base On... This pop-up menu is active in any colorizing mode except None. It selects what channel should be used as input. The possible choices are:
Lightness - Use lightness values.
Luminance - Use luminance values.
Alpha - Use alpha channel.
Alpha Edges - Use the edges of the alpha channel. When this mode is active, a new slider at the bottom of the colorizing group is enabled. This is called Edge Thickness and controls how thick the alpha edges should be.
Red - Use red channel.
Green - Use green channel.
Blue - Use blue channel.

Alpha | Alpha Edges Low Thickness | Alpha Edges High Thickness