2011

Table Of Contents
(a) Tolerance sliders (b) Tolerance and Softness value fields (white range) (c) 1.0 white
indicator (d) Softness sliders (e) 0.0 black indicator (f) Sharpness value field
(g) Tolerance and Softness value fields (black range)
To:Use:
Change the tolerance's luma range (drag the cursor or enter a value in
the Tolerance value field).
Tolerance
Change the luma range of the softness (drag the cursor or enter a value
in the Softness value field).
Softness
Change the sharpness of a key. Sharpness filters the softness range in-
dependently of the pixel sampled from the key-in composition. There-
Sharpness
fore, the softness range is filtered according to its luma values in the
generated matte. Increasing sharpness reduces softness, decreasing
sharpness increases softness.
NOTE Tolerance, Softness and Sharpness are animatable attributessee Marking
Attributes for Keyframing
on page 674.
Creating a Difference Matte Using the
Difference Tool
The Difference tool lets you generate a matte image from two source images
with the same background, but different foreground elements. This allows
you to remove an image from one context and add it to another. You can
even generate a composite image while creating the difference matte.
When you generate a difference matte, the difference between corresponding
pixels of the two source images is calculated. The value of the pixel in the
back image is subtracted from the value of the corresponding pixel in the
front image, and the resulting value is used in the difference matte.
Creating a Difference Matte Using the Difference Tool | 517