![]() When you key out a value, all pixels that have similar colors or luminance values become transparent. Keying is defining transparency by a particular color value (with a color key or chroma key) or brightness value (with a luminance key) in an image. Then you'll add a title to the promo, and place a station ID into the composition to complete the project. You'll learn how to use keying effects to remove the green background and clean up the edge of the key to remove any lingering green spill. You'll begin by working with live-action footage of an actor captured on a greenscreen stage. In this exercise, you'll build a promotional spot for a weekly news segment on a fictional television station. Adjust the contrast of an image by using the Levels effect.Key out a background by using the Keylight effect.Use the Spill Suppressor effect to remove unwanted light spill.Check an image's alpha channel for errors in a key.Use the Color Difference Key effect to key an image.In this exercise, you'll learn how to do the following: Used with permission of Pearson Education, Inc. This article is adapted from Adobe After Effects CS3 Professional Classroom in a Book.
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