Ice Halos
Description
Ice halos are created when small ice crystals in the atmosphere generate halos by reflecting and refracting light. Most notably, circles form around the sun or moon as well as rare occurrences when the entire sky is painted with a web of arcing halos.
Category
Light.
Controls
Presets
To select a preset, pick one from the Presets window.
Light
Blend
Determines the blend mode to be used to add the ice halo.
Add
The ice halo is added to your image.
Screen
The ice halo is combined with the image using a Screen blend mode. This looks kind of like the Add blend mode, but highlights are retained.
Brightness
Sets the intensity of the ice halo.
Displacement
Displaces the ice halo by the luminance values of the image. This “fakes” the effect of the ice halo wrapping over objects in the image.
Blur
Sets the softness of the ice halo.
Halo
Blend
The ice halo can be added to the entire image or limited to a matte.
Halo Only
The ice halo is added to the entire image.
Matte
The ice halo is added only in areas of the matte.
Sun Altitude
Selects the appropriate ice halo pattern based on the sun’s altitude.
Position
The ice halo position can be adjusted by clicking and dragging the on-screen control or sliders.
Scale
Scale X
The horizontal scale of the ice halo.
Scale Y
The vertical scale of the ice halo.
Gang Scale
The Scale X and Scale Y slider values can be ganged together.
Matte
A matte can be used to limit where the ice halo will be placed. Wherever there is white in the matte is where the ice halo will be added. Go to the Matte parameters to see how they work.
Note: To use a matte to limit where the ice halo will be added, Halo > Blend must be set to Matte.
Alpha
Halo Under Source
Composites the image over the ice halos.