Adobe After Effects CS3 - Manual (Page 475)

AFTER EFFECTS CS3
User Guide
470
Clean Solid Areas Controls the extent to which adjacent pixels with low variations in value are smoothed out by the
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.
7 Adjust the Unsharp Mask controls to enhance subtle edge detail that may have been suppressed by the degraining.
8 If you are applying the effect to a sequence of frames, use the Temporal Filtering controls to perform interframe
noise reduction.
9 To change the effect view, choose any of the following from the Viewing Mode pop-up menu:
Noise Samples Shows the areas that have been sampled to extract the current noise model.
Preview Displays the current settings of the applied effect in a 200x200 pixel area.
Blending Matte 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.
10 Choose Final Output from the Viewing Mode control.
Add temporal filtering to a sequence
1 Apply the Remove Grain effect to your image.
2 Place the Remove Grain preview region over the area of the image that has the most subtle changes from frame to
frame or that has the most moving image detail.
3 Select Enable in the Temporal Filtering controls.
4 Adjust the Amount value to 100%.
5 Create a RAM preview of the sequence or render it.
6 If you see unwanted streaking or blurs around moving objects, reduce the Motion Sensitivity value, and then
preview or render it again.
7 Try the following techniques if you want to improve the results:
• To quickly reduce the noise of a sequence that has a lot of buzzing noise, set the Noise Reduction value to zero and
the Temporal Filtering Amount to 100%, and render the sequence.
• To speed up previews, apply temporal filtering to your sequence after all the settings for a single frame have been
adjusted.
• To retain a layer’s effects and also apply temporal filtering to it, precompose the selected layer (choose Layer >
Precompose), and then apply the Remove Grain effect to that layer.
Sharpen an image with Unsharp Mask controls
The Remove Grain effect contains Unsharp Mask controls, which increase the contrast of edges and fine details to
help restore some of the sharpness that may have been lost during the grain reduction process.
❖ Do any of the following:
• Increase the Unsharp Mask controls Amount value to obtain acceptable sharpening without generating
undesirable artifacts or bringing back too much grain.
• Increase the Threshold value to remove any unwanted artifacts that resulted from the sharpening.
• Adjust the Radius to change the area over which Unsharp Mask finds details.
• Adjust the Noise Reduction value until the image just begins to lose sharpness; then decrease the value a little, and
then apply the Unsharp Mask controls to sharpen the image.