5

For additional control over the transparency matte, use the Color Selection controls and
the Matte Tools in the Filters Inspector. These controls provide options for creating a
seamless composite without adding more Keyer filters.
To refine a key using the Color Selection controls
1 With the Keyer filter selected in the Layers list, set the View mode in the Filters Inspector
to Matte.
Matte mode lets you see how your adjustments affect the transparency of the image.
The keyed image now appears in grayscale: white areas represent solid pixels in the final
matte; black areas represent transparent pixels in the final matte, and varying levels of
gray represent translucent pixels in the final matte (darker gray is more transparent; lighter
gray is more opaque).
2 Click the disclosure triangle in the Color Selection row of the Filters Inspector to reveal
additional controls.
3 Choose one of the two Graph modes to select a mode for the adjustments you need:
• Scrub Boxes: Remain in Scrub Boxes mode (the default) if you are satisfied with the
current key but want to adjust the edge softness of the resulting matte. In Scrub Boxes
mode, you can adjust the outer graph of the Chroma control and the lower handles of
the Luma control to increase or decrease the translucency of the edges of the matte.
• Manual: Click Manual to make substantial alterations to tolerance (core transparency)
and edge softness in matte. In Manual mode, you can adjust the inner and outer graphs
of the Chroma control, as well as the upper and lower handles of the Luma control to
alter all aspects of transparency in the matte. In Manual mode, you cannot alter the
Strength parameter or add more Sample Color or Edges controls in the Canvas.
After you enter Manual mode, do not return to Scrub Boxes mode.
Note: For more information on keyframing the Color Selection controls, see Animating
Parameters in the Keyer Filter.
654 Chapter 13 Keying