ADOBE AFTER EFFECTS 7.0
User Guide
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Adjust the following controls for the Noise Alpha effect:
Noise
Specifies the type of noise the effect uses. 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 contrast.
Amount
Specifies the amount of noise that’s added to the layer.
Original Alpha
Specifies how to apply noise to the alpha channel of a layer. Add produces equal amounts of noise in
the transparent and opaque areas of the layer. Clamp produces noise in the opaque areas only. Scale increases the
amount of noise proportionate to the level of opacity and produces no noise in 100% transparent areas. Edges
produces noise only in partially transparent areas, such as the edge of the alpha channel.
Overflow
Specifies how the effect remaps values that fall outside the grayscale range of 0-255. Clip displays values
above 255 as opaque and values below 0 as transparent. Wrap Back forces values back into the 0-255 range, creating
subtle details. For example, a value of 256 wraps back to 254, and a value of -1 wraps back to 1.
Random Seed
Specifies a random value for noise. This control is active only if you choose Uniform Random or
Squared Random.
To produce flashing noise, animate the Random Seed control. To create smoothly animated noise, animate the Noise
Phase value.
Noise Phase
Specifies the placement of noise. This control is active only if you choose Uniform Animation or
Squared Animation from the Noise pop-up menu.
Noise Options (Animation)
Specifies how you animate noise.
•
Cycle Noise
Produces a cycle of noise that plays through once in the specified amount of time.
•
Cycle
Specifies the numbers of revolutions of the Noise Phase that the noise cycles through before it repeats
(available only when Cycle Noise is selected).
Alter the timing of the Noise Phase keyframes to adjust the speed of the Noise Phase cycles.
To save time animating the Noise Phase value, use the Cycle Noise option to create a seamless noise loop. Then,
render the layer, and reimport it as a new source footage.
Noise HLS effect and Noise HLS Auto effect
The Noise HLS effect generates static noise in layers that use still or moving source footage. The Noise HLS Auto
effect automatically creates animated noise. Both effects offer various types of noise that can be added to the hue,
saturation, or lightness of a layer. Controls for these effects are the same except for the final control that determines
noise animation.
These effects work with 8-bpc color.
Original (left), and with effect applied (right)
Summary of Contents for AFTER EFFECTS 7.0
Page 1: ...Chapter 1 User Guide...
