Multichannel; Single Channel; Chroma Suppression; Noise Size Bias - Adobe AFTER EFFECTS 7.0 Manual

Choose Effect > Noise & Grain > Remove Grain.
2
Adjust any of the following using the Noise Reduction Settings controls group:
3
•
To adjust the overall amount of noise in the image, adjust the Noise Reduction value.
•
To adjust the amount of noise on each channel individually, adjust the Red, Green, and Blue Noise Reduction
values in the Channel Noise Reduction controls.
The blue channel often has the most pronounced grain in a chemical film-based image. Try reducing the noise in
only the blue channel to retain all image detail in the other two channels.
Adjust the Passes value to control the maximum noise radius that can be detected:
4
•
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.
Note: Once the optimum number of passes is applied, additional passes have no effect.
Choose one of the following from the Mode pop-up menu:
5
Degrains all channels of a color image together, which generally produces the best results on color

Multichannel

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

Single Channel

causes objectionable color artifacts.
6 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 very

Chroma Suppression

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 is especially useful to reduce
Texture
objectionable artifacts or to retain finely textured areas such as wood grain, brick, or the like. 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.

Noise Size Bias

The default value of zero treats all sizes equally. Negative values leave larger residual noise and more aggressively
remove smaller-sized grain; this leaves larger residual noise after degraining. 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
Clean Solid Areas
noise reduction process. This 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.
Adjust the Unsharp Mask controls to enhance subtle edge detail that may have been suppressed by the degraining.
7
If you are applying the effect to a sequence of frames, use the Temporal Filtering controls to perform inter-frame
8
noise reduction.
To change the effect view, choose any of the following from the Viewing Mode pop-up menu:
9
Shows the areas that have been sampled to extract the current noise model.
Noise Samples
ADOBE AFTER EFFECTS 7.0
359
User Guide