Game Development Reference
This way, you can easily tell exactly how well you did at keying.
In most instances, you will need a pure black background (which
indicates complete transparency), a pure white subject (white
indicates full opacity), and gray along the edges (which indicates
partial transparency). In our matte here, we can see that we have
a little bit of gray on the fringes of my hair, which is great. This
will help those fringes of hair composite better into their new
background. In the Color Difference Key effect, you can view this
grayscale matte by changing the View value to Matte Corrected
( Fig. 10.7 ).
Figure 10.7 The Matte Corrected
option in the View drop down
shows us our key as grayscale
values. These values indicate
the degree of transparency in