Grain effect to prevent banding of colors (OnionRings)
AE Grain effect is one of the powerful grain Ive seen.
I mainly use it to cancel banding (OnionRings) when encoding to MP4s.
It should be used as effect inside of encoder+be much faster because it is a very heavy effect.
Adding grain to a file makes it easy to get rid of banding, AE Grain effect knows:
1. To put grain in places based on highlights and shadows(where the risk of banding is usually high)
2. To put different amount of noise on different color channels. (Usually its enough for the encoder to have more detail in the blue channel ans less on the red and green, so there is no need to destroy the all quality of the picture.