Adobe After Effects - Manual (Page 610)

Note:
Multichannel
Single Channel
Chroma Suppression
Texture
Noise Size Bias
Clean Solid Areas
Noise Samples
Preview
Blending Matte
3. Adjust the Passes value to control the maximum noise radius that can be detected:
If your grain is large and chunky, try increasing the Passes value. A higher number of passes reduces larger-sized noise.
If your render time is longer than desired because your file size is large, try lowering the number of passes to reduce the memory usage
and render time.
Once the optimum number of passes is applied, additional passes have no effect.
4. Choose one of the following from the Mode pop-up menu:
Degrains all channels of a color image together, which generally produces the best results on color images. This mode takes
advantage of correlations between channels to improve the accuracy of the denoising process.
Degrains each channel independently. Use this mode for a monochromatic image or if Multichannel causes objectionable
color artifacts.
5. Adjust any of the following in the Fine Tuning controls group to improve the balance between noise reduction and retained sharpness:
Suppresses some of the chroma from the noise to clean up the image. If the noise is colorful, increasing this control
can help remove it. Setting the amount too high may strip some chroma from the image itself. (Chroma Suppression has no effect on
grayscale images and isn’t available if the Noise Reduction Settings Mode is Single Channel.)
Controls the amount of low-level noise that passes through to the output. This setting is especially useful to reduce objectionable
artifacts or to retain finely textured areas such as wood grain or brick. Lower values result in a smoother, possibly artificial-looking result.
Higher values may leave the output unchanged from the input.
Controls how the noise reduction process responds to variations in noise size within the same image. The default value of
zero treats all sizes equally. Negative values leave larger residual noise and more aggressively remove smaller-sized grain. Positive values
leave smaller noise and more aggressively remove noise of larger size.
Controls the extent to which adjacent pixels with low variations in value are smoothed out by the noise reduction
process. This setting is helpful for large areas of solid color that need to be as clean as possible. Settings that are too high can smooth out
nearly solid areas of the image, resulting in an artificial appearance.
6. Adjust the Unsharp Mask controls to return subtle edge detail that the degraining removed.
7. Use the Temporal Filtering controls to perform interframe noise reduction.
8. To change the effect view, choose any of the following from the Viewing Mode pop-up menu:
Shows the areas that have been sampled to extract the current noise model.
Displays the current settings of the applied effect in a 200x200 pixel area.
Shows the current color matte or mask, or the combination of both, which results from the current settings of the Blend
With Original controls group.
9. Choose Final Output from the Viewing Mode control.
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