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The color that’s suppressed in the final image is based on the sampled portion of the
image. The Spill Level slider controls how much spill suppression is applied to the keyed
subject. For example, if the subject was shot in front of a green screen background,
increasing the Spill Level value adds magenta to the foreground image, which neutralizes
any unwanted green cast that your subject may be exhibiting. Spill suppression can be
further customized using the controls in the Spill Suppression group, described later.
Setting Spill to 0 turns off spill suppression.
Invert: Select this checkbox to Invert the generated matte, so solid areas become
transparent, and vice versa.
Color Selection: Click the disclosure triangle in the Color Selection row to reveal controls
for adjusting the tolerance (core transparency) and softness (edge transparency) in the
chroma and luma channels of the keyed region. Which controls are adjustable depends
on the Graph mode (Scrub Boxes or Manual) you select in this group of controls.
These controls are meant to be used after you begin creating a key using automatic
sampling or the Sample Color and Edges tools. (However, you can skip those tools and
create a key using the Color Selection controls in Manual mode.) The graphical Chroma
and Luma controls in the Color Selection group provide a detailed way of refining the
range of hue, saturation, and image lightness that define the keyed matte.
643Chapter 13 Keying