Adobe After Effects - Manual (Page 607)

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Amount Of Noise
Noise Type
Clipping
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Noise
Amount
Original Alpha
Add
Clamp
Scale
Edges
This effect works with 8-bpc and 16-bpc color.
Original (left), and with effect applied (right)
Noise effect
The Noise effect randomly changes pixel values throughout the image.
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
Original (left), and with effect applied (right)
The amount of noise to add.
Use Color Noise adds random values to the red, green, and blue channels individually. Otherwise, the same random value is added
to all channels for each pixel.
Clips color channel values. Deselecting this option causes more apparent noise. This control does not work in a 32-bpc project.
Noise Alpha effect
The Noise Alpha effect adds noise to the alpha channel.
This effect works with 8-bpc color.
The type of noise. Unique Random creates equal amounts of black and white noise. Squared Random creates high-contrast noise. Uniform
Animation creates animated noise, and Squared Animation creates animated high-contrast noise.
The magnitude of the noise.
How to apply the noise to the alpha channel:
Produces equal amounts of noise in the transparent and opaque areas of the clip.
Produces noise in the opaque areas only.
Increases the amount of noise proportionate to the level of opacity and produces no noise in 100% transparent areas.
Produces noise only in partially transparent areas, such as the edge of the alpha channel.
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