Adobe 12040118 - After Effects Standard Tutorial page 454

applying it to the destination.
To use this control automatically, set the Compensate For Existing Noise slider to 100%. You can then view the noise samples in the destination
layer by choosing Compensation Samples in the Viewing Mode menu. You can also reposition the samples in the destination image by setting
Sampling Mode to Manual, which makes the Compensation Sample Points available for manual repositioning.
1. Apply the Match Grain effect to the destination layer.
2. In the Effect Controls panel, adjust the Compensate For Existing Noise value under the Match Grain effect as needed. The noise in the
source layer and the noise in the destination layer are sampled, and their difference is calculated, so that only enough noise to match the
destination layer to the source layer is applied to the destination.
3. To modify the noise samples, choose Noise Samples from the Viewing Mode menu, change the Sampling > Sample Selection control to
Manual, and then expand the Compensation Sample Points. The current value of Number Of Samples determines how many points are
available.
4. To reposition each sample point, do any of the following:
Drag each sample point in the Composition panel to a new location.
Enter new x and y coordinates adjacent to the sample point under the Compensation Sample Points controls in the Effect Controls panel.
Click the point parameter
the point in the Composition panel.
5. Choose Final Output from the Viewing Mode control.
Median effect
The Median effect replaces each pixel with a pixel that has the median color value of neighboring pixels with the specified Radius. At low Radius
values, this effect is useful for reducing some types of noise. At higher Radius values, this effect gives an image a painterly appearance.
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)
Amount Of Noise The amount of noise to add.
Noise Type 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.
Clipping 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.
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.
for the Compensation Sample Point in the Effect Controls panel, and then click where you want to move
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