Apple Shake 4 - Manual (Page 702)

702 Chapter 24 Keying
7 As an optional step, you may find it necessary to insert a DilateErode node between the
Keylight and Max nodes in order to erode the output matte from the Keylight so it
doesn’t interfere with the edge created by the LumaKey.
This produces a mask that you can then recombine with the original foreground image
and a background image using a KeyMix node. You’ll probably have to deal with some
spill suppression, but you can use the same techniques described in “
Blue and Green
Spill Suppression ” on page 687.
Note: If you’re really detail-oriented, you can combine both of the above methods, in
an effort to preserve more detail from the greenscreen key performed in method two.
Keying Functions
The following section details the keying nodes located in the Key Tool tab. The
ColorReplace node, discussed above, is located in the Color Tool tab. For more
information, see Chapter 23, “
Color Correction .”