Optics
Diffusion
A diffusion filter: light is moved, not added.
Controls
- scatter
- What share of the light is scattered. Not a blur strength: the light in the halo is taken out of the direct image
- radius
- How far the scattered light travels from where it started
- absorb
- Two different filters. At zero the shadows lift and the frame goes milky; at one the particles swallow that light and blacks stay black
- quality
- How many blur passes are stacked. One leaves a hard step at the edge of the halo, three a soft falloff
- contrast
- A number from -1 to 1, 0 by default.