Apple Final Cut Pro X (10.0.9) - Manual (Page 346)

Chapter 12 Keying and compositing 346
7 To leave smoothly aliased text or graphics in the image visually intact, which can improve the
edges, select Preserve RGB.
8 To mix the keyed effect with the unkeyed effect, adjust the Mix control.
For information about making advanced luma key adjustments, see the following instructions.
Make advanced luma key adjustments
The following controls are available for use in difficult keying situations or for fine-tuning
specific problems:
•
Matte Tools: These controls are for refining the transparency matte generated by the previous
sets of parameters. These parameters don’t alter the range of values sampled to create the
keyed matte. Instead, they alter the matte generated by the Keyer effect’s basic and advanced
controls, letting you shrink, expand, soften, or invert the matte to achieve a better composite.
•
Light Wrap: These controls are for blending color and lightness values from the background
layer of your composite with the keyed foreground layer. Using these controls, you can
simulate the interaction of environmental lighting with the keyed subject, making it appear as
if background light wraps around the edges of a subject.
The following steps assume you have applied the luma key effect.
1 In the Timeline, select the clip with the Luma Keyer effect.
2 Open the Video inspector.
The Effects section of the Video inspector shows the parameters available for adjusting the Luma
Keyer effect.
3 Click Matte Tools to reveal the following controls: