User Manual

Table Of Contents
Blur Radius
In small amounts, blurring a key does well to take the edge off problem edges. However,
blurring a key can also feather the edges of a key past the border of the subject you’re keying,
with the result being a visible “halo” around your subject depending on the adjustment you’re
making. The range is 0 to 2000, with 0 being the default. With such a large maximum blur
radius, combined with the capabilities that the In/Out Ratio provides in customizing the direction
of spread, you can turn some pretty precarious mattes into surprisingly smooth and
useful results.
TIP: If haloing is a problem, you can try adjusting the In/Out Ratio parameter, or you
may want to consider using the Qualifier Softness parameters to feather the edges of
the key, instead.
Using the blur parameters to soften the edges of a key
In/Out Ratio
Controls whether the “Blur Radius” is applied equally to the inside and outside of the edge of
the matte (zero), applied only within the matte (negative values), or applied only outside the
matte (positive values). Using In/Out Ratio can help eliminate fringing when using the Blur
Radius parameter.
(Left) In/Out Ratio lowered so blurring ends at the edge of the matte and feathers inward, (Right) In/Out Ratio
raised so that blurring starts at the edge of the matte and feathers outward
However, you can also use In/Out Ratio even in situations where no Blur Radius is applied at all.
Raising In/Out Ratio will fill in small black holes in the matte, while lowering In/Out Ratio below 0
will eliminate speckling by pushing small white bits of the matte toward black.
(left) In/Out Ratio controls lowered to expand holes in the matte, (Right) In/Out Ratio controls raised to fill in small
black holes in the matte
Chapter – 119 Secondary Qualifiers 2714