Adobe 65021048 User Guide - 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 conditions such as smoke or heat, especially with animated blur layers. Original (left), blur layer (center), and result (right) Maximum Blur The maximum amount, in pixels, that any part of the affected clip can be blurred. Stretch Map To Fit Stretches the control clip to the dimensions of the clip to which it is applied; otherwise, the 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) Direction The direction of the blur. The blur is applied equally on either side of a pixel's center; therefore, a setting of 180° and a setting of 0° look the same. April 1, 2008