User Manual

Final grade, the talent in color with a B&W background
Subtracting One Key from Another
The way multiple keys are combined within the Key Mixer depends on a pair of Key Input
buttons you can toggle using the Key palette. In the following example, a partial green tint is
washed throughout the midtones of the image using a qualifier, but you want to exclude the
man’s skin tone from this operation. Using the Key Mixer, you can subtract one key from another
to accomplish this with ease.
A selective blue tint added to the midtones of the image
includes the red sign
To change the Key Input settings for a node connected to a Key Mixer:
1 In this example, Node 2 is isolating part of the midtones of the image, and feeding
its key through the Key Mixer to Node 4, which is using it to apply a partial blue tint.
However, in preparation for subtracting the skin tone from this operation, Node 3 is
isolating the man’s skin tone.
A node setup in preparation of subtracting the Bar sign from
the midtone isolation being used to add a partial blue tint
Chapter – 126 Combining Keys and Using Mattes 2870