User guide

KeylightThe Foundry
ADVANCED KEYING
29
Inside & Outside Mattes
add those pixels to the matte we’re creating. Switch Render back to show
the Inside Matte. Each time you pick from the foreground you
add to the
selections you have made.
Colour Differentiation This determines how closely the matte can tell colours apart. If set to
coarse then selected colours that are quite different will be lumped together
to form the matte. Setting the Colour Differentiation to fine will require
more picking of colours to gather in the same colour range and produce a
similar matte. In
Figure 56 and Figure 57 the outside matte has been picked
once and then the Colour Differentiation set to Coarse then Fine. See how
the matte differs.
Inside/Outside Masks If used in the tree, Keylight can have externally generated Inside and
Outside masks fed into it.
Note This option will only show up when Keylight is used in a tree.
This option, available in the Inside/Outside Mask Property page, is used to
control how these masks are handled. They can be
ignored , or you can use
luminance or use alpha as the source of the external mask.
Figure 54. Outside Matte. Figure 55. Status showing clean background
with Outside Matte.
Figure 56. Coarse. Figure 57. Fine.