Apple Final Cut Pro 7 - Manual (Page 1052)

Result Filter
Keys the blue or green area of a clip and uses the selected color as
a transparency mask for compositing foreground elements against
a background scene. A View pop-up menu allows you to look at
the source of the clip (with no key applied), the matte created by
the filter, the final matted image, or a special composite of the
source, matte, and final image for reference. A Key Mode pop-up
menu allows you to choose blue, green, or a blue/green difference
as the key color. The Color Level slider lets you specify the amount
of blue or green in your clip to key out, and the Color Tolerance
slider allows you to expand the key into adjacent areas containing
other shades of the key color. The Edge Thin slider allows you to
expand or contract the matte area to try to eliminate fringing, and
the Edge Feather slider lets you blur out the edges of the matte to
create a smoother key. (Before you use these sliders, try using a
Matte Choker filter instead.) An Invert checkbox allows you to invert
the matte, making what was masked solid and what was solid
masked. Blue and Green Screen
Allows you to create a key using any range of color you want,
including (but not limited to) the usual blue and green. You can
also fine-tune your composite by adjusting the color value,
saturation, and luma ranges used to define your key, together or
separately. For example, if you only want to perform a luma key,
you can turn off color and saturation. Even when performing a color
key, you’ll get superior results by manipulating the Color Range and
Saturation controls separately. Chroma Keyer 1
Keys on any color in a clip. Color controls allow you to select a color
from your clip as the specified key color. Sometimes referred to as
chroma key. Color Key
Improves the quality of chroma keys and reduces diagonal
“stairstepping” that can occur in video clips with areas of
high-contrast color. Use 4:1:1 Color Smoothing with NTSC or PAL
DV-25 video sources. (The exception is PAL mini-DV/DVCAM, which
uses 4:2:0 color sampling.) Use 4:2:2 Color Smoothing for DVCPRO
50, DVCPRO HD, and 8- and 10-bit uncompressed video. To improve
the quality of your chroma key, apply the appropriate smoothing
filter to the clip you want to chroma key first. As you add additional
key filters, make sure that the Color Smoothing filter remains the
first one in the video section of the Filters tab. Color Smoothing - 4:1:1
Color Smoothing - 4:2:2
Compares two clips and keys out areas that are similar. A View
popup menu allows you to look at the source of the clip (with no
key applied), the matte created by the filter, the final matted image,
or a special composite of the source, matte, and final image for
reference. The Difference Layer clip well allows you to specify
another clip to compare the current image to for keying. Threshold
and Tolerance sliders let you adjust the key to try to isolate the parts
of your image that you want to keep. Difference Matte
1052 Chapter 65 Video Filters Available in Final Cut Pro