Noise Alpha effect
The Noise
Alpha effect adds noise to the alpha channel.
This effect works with 8-bpc color.
- Noise
- 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.
- Amount
- The magnitude of the noise.
- Original Alpha
- How to apply the noise to the alpha channel:
- Add
- Produces equal amounts of noise in the transparent and opaque
areas of the clip.
- 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
- How the effect remaps values that fall outside the grayscale
range of 0-255:
- Clip
- Values above 255 are mapped to 255. Values below 0 are mapped
to 0.
- Wrap Back
- Values above 255 or below 0 are reflected back into the 0-255 range.
For example, a value of 258 (255+3) is reflected to 252 (255-3),
and a value of ‑3 is reflected to 3.
- Wrap
- Values above 255 and below 0 are wrapped back around into
the 0-255 range. For example, a value of 258 wraps around to 2,
a value of 256 wraps around to 0, and a value of ‑3 wraps around
to 253.
- Random Seed
- An input value to the random number generator for the 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.
- Noise Options (Animation)
- How noise is animated.
- 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 re-import it as a new source footage
item.
