Adobe 65021048 User Guide - Page 341

ADOBE PREMIERE PRO CS3 335 User Guide Color Replace effect (Windows only) The Color Replace effect replaces all occurrences of a selected color with a new color, preserving any gray levels. Using this effect, you could change the color of an object in an image by selecting it and then adjusting the controls to create a different color. See also "Replace a color" on page 273 Gamma Correction effect The Gamma Correction effect lightens or darkens a clip without substantially changing the shadows and highlights. It does this by changing the brightness levels of the midtones (the middle-gray levels), while leaving the dark and light areas unaffected. The default gamma setting is 1.0. In the effect's Settings dialog box, you can adjust the gamma from 0.1 to 2.8. Keying effects Alpha Adjust effect Use the Alpha Adjust effect in place of the Opacity effect when you need to change the default render order of Fixed effects. Change the opacity percentage to create levels of transparency. The following Alpha Adjust effect settings let you interpret the alpha channel in the clip: Ignore Alpha Ignores the alpha channel of the clip. Invert Alpha Reverses the transparency and opaque areas of the clip. Blue Screen Key effect The Blue Screen Key effect makes all image pixels that are similar to a standard bluescreen transparent. See also "About Blue Screen Key" on page 371 Chroma Key effect The Chroma Key effect keys out all image pixels that are similar to a specified key color. When you key out a color value in a clip, that color or range of colors becomes transparent for the entire clip. Control the range of transparent colors by adjusting the tolerance level. You can also feather the edges of the transparent area to create a smooth transition between the transparent and opaque areas. April 1, 2008