User guide

KeylightThe Foundry
ADVANCED KEYING
21
Render
If you then set the 'Despill Bias' to be 25, you will keep the nice alpha, and
get a good despill as well (Figure 28).
Render
After picking the Screen Colour it’s useful to be able to view the key in
different ways. You can do this using the Render drop-down menu, shown
here in
Figure 29.
Figure 29. Render menu.
Here’s the complete list of options and what they do.
• Result - renders the foreground composited over the image on the
background track. This image is premultiplied. In other words, the RGB
values of pixels have been multiplied by their corresponding alpha
channel values.
Figure 27. Poor despill. Figure 28. Final Key, Using Separate Despill
and Alpha Biases.