Keying
13
Important:
Keying to isolate a foreground subject is not always easy; it takes time and
patience to learn how to use the parameters in each filter to achieve the best effect. Most
keys are “pulled” using more than one tool. Good compositing artists usually combine
masked keyer filters, matte adjustment filters, spill suppression operations, and garbage
or holdout masks to isolate a single subject. The Keyer filter in Motion combines many
of these operations within a single set of parameters. Two other Motion keying
filters—Matte Magic and Spill Suppression—provide standalone access to these finishing
operations. For more information on techniques you can use to improve a key, see
Applying Multiple Keys to a Single Subject
.
Keying is accomplished using one of two keyer filters in Motion. The Keyer filter is a
general purpose color-keying filter that’s capable of blue screen or green screen keying,
or keying any range of color you choose. The Luma Keyer generates mattes based on a
sampled range of lightness in the image. Both keyer filters, as well as the Matte Magic
and Spill Suppression filters, are located in the Keying category of filters in the Motion
Library. (For basic information about Motion filters, see
Using Filters
.)