Adobe 65021048 User Manual page 309

ADOBE PREMIERE PRO CS3 303
User Guide
Channel Blur effect
The Channel Blur effect blurs a clip's red, green, blue, or alpha channels individually. You can specify that the blur
is horizontal, vertical, or both.
Select Repeat Edge Pixels to make the blur algorithm operate as if the pixel values beyond the edge of the clip are
the same as those of the edge pixels. This option keeps edges sharp, preventing the edges from darkening and
becoming more transparent—the result of being averaged with a lot of zeroes. Deselect this option to make the blur
algorithm operate as if the pixel values beyond the edge of the clip are zero.
Compound Blur effect
The Compound Blur effect blurs pixels in the effect clip based on the luminance values of a control clip, also known
as a blur layer or blurring map. By default, bright values in the blur layer correspond to more blurring of the effect
clip, 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 condi-
tions such as smoke or heat, especially with animated blur layers.
Original (left), blur layer (center), and result (right)
The maximum amount, in pixels, that any part of the affected clip can be blurred.
Maximum Blur
Stretches the control clip to the dimensions of the clip to which it is applied; otherwise, the
Stretch Map To Fit
control clip is centered on the effect clip.
Directional Blur effect
The Directional Blur effect gives a clip the illusion of motion.
Original (left), and with effect applied (right)
The direction of the blur. The blur is applied equally on either side of a pixel's center; therefore, a setting
Direction
of 180° and a setting of 0° look the same.
April 1, 2008