Adobe 65008009 - After Effects CS4 Using Manual page 447

Last updated 12/21/2009
When Colorize is selected, the Bilateral Blur effect operates on each color channel individually. The result is a color
image.
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"About Blur & Sharpen effects" on page 440
Box Blur effect
Box Blur is similar to Fast Blur and Gaussian Blur, but Box Blur has the added advantage of an Iterations property,
which allows you to control the quality of the blur.
Stu Maschwitz compares the Box Blur, Fast Blur, and Gaussian Blur effects in a post on his
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
How many times the blur is sequentially applied to the image. A value around 3 gives a blur similar in
Iterations
quality to Fast Blur. A higher number of iterations creates smoother transitions between colors and increases the blur,
but it also increases the render time. The default value creates boxy results.
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"About Blur & Sharpen effects" on page 440
Channel Blur effect
The Channel Blur effect individually blurs the red, green, blue, or alpha channels of a layer.
Note: If you have noise or artifacts primarily in one color channel—such as MPEG compression artifacts in the blue
channel of DV footage—use Channel Blur to clean up the noise in that channel, leaving the other channels sharp.
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
More Help topics
"About Blur & Sharpen effects" on page 440
Compound Blur effect
The Compound Blur effect blurs pixels in the effect layer based on the luminance values of a control layer, also known
as a blur layer or blurring map. By default, bright values in the blur layer correspond to more blurring of the effect layer,
while dark values correspond to less blurring; select Invert Blur for light values to correspond to less blurring.
This effect is useful for simulating smudges and fingerprints, or changes in visibility caused by atmospheric conditions
such as smoke or heat, especially with animated blur layers such as those generated with the Turbulent Noise effect.
This effect works with 8-bpc, 16-bpc, and 32-bpc color.
USING AFTER EFFECTS CS4
Effects and animation presets
ProLost blog.
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