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592Final Cut Pro User Guide
Adjust the chroma key effect
1. In the Final Cut Pro timeline, select the foreground clip with the Keyer effect, then open
the Video inspector.
Controls for modifying and improving the Keyer effect appear.
2. If the Select tool is not the active tool, choose it from the Tools pop-up menu above the
timeline (or press A).
3. To improve the key using controls in the viewer, use the Refine Key and Strength
controls to do any of the following:
• Identify areas of the foreground clip that might still have some of the chroma key
color showing: Click the Sample Color thumbnail image in the Video inspector and
draw a rectangle in the viewer over the area where the chroma key color needs to be
removed.
Note: By default, the Keyer effect applies spill removal, which causes any leftover
fringing of the blue- or green-screen background color you’re making transparent to
appear as gray. To see the original color, set the Spill Level parameter to 0%.
To improve the key, you can drag the rectangle to adjust its position or drag its
corners to change its size, and you can drag additional rectangles over any areas
with the chroma key color still showing.
Tip: Select Matte (the center button) in the View area in the Video inspector to
see the matte that the chroma keyer is creating. This can make it much easier to see
areas that are not keying well.