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with the curve changes relative to the height of the point on the curve in the
curve editing area.
Each curve is a hue gradient and as the shape of the curve changes, the colors
along the curve's gradient change to reflect the result. For example:
■ Raising the blue curve over the darker luma range, the curve along that
range becomes bluer (for all pixels with a lower mean luma value, the blue
channel value increases—the result in the image is that blue is added to
the shadows)
■ Lowering the saturation curve over the lighter luma range, the saturation
curve over that range desaturates (for all pixels with a higher mean-luma
value, the saturation value decreases—the result in the image is that
highlights wash out).
Keyer Super Tool
The Keyer super tool provides you with an envelope to perform all keying
tasks. The Keyer super tool also provides increased flexibility with the option
of adding more tools (or removing existing ones) from the super tool
schematic.
About the Keyer Super Tool
The Keyer is a super tool that combines a Screen Degrain, Master Keyer matte
generator, Cleanup Alpha tool, Edge tool, Garbage Mask, and a Spill & Blend
operator in one tool.
Using the Master Keyer matte generator, you can make parts of an image
transparent by selecting and isolating regions of color. This process creates an
alpha channel matte, which is then used to composite the image over a new
background.
With the Master Keyer matte generator, you can refine the key by gesturally
modifying the matte, removing color spill, blending edges, applying patches,
and removing grain.
The following are examples of typical uses for the Keyer supertool:
■ Pulling a rough matte
■ Refining a matte
522 | Chapter 22 Pulling Keys and Creating Mattes