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Chapter 5 Basic Operations
76 Composing Video With Keys
Composing Video With Keys
A key is an effect in which color and shape information is used to cut out part
of the background video and replace it with another color or other video. The
signal determining how the background is cut out is termed the “key source,”
and the signal that replaces the cut-out part is termed the “key fill.”
This system supports the following types of keys.
Luminance key/linear key: Used to insert titles and logos into the video. The
key source often shows black and white text, which is detected by using the
luminance (Y) signal.
Chroma key: Used to compose scenes with two different components, for
example people and a background. A key signal based on a particular color
is used to cut out the background.
Pattern key: Video is composed using various patterns. A special pattern is
used as the key source.
Flow of Operations
The following figure shows a typical flow of operations when using the MFS-
2000 system. For details about operations, see the pages in parentheses ( ).
Basic operations
: Always done
: Done as required
: Done at this stage
Select an effect (page 56)
Prepare the transition (page 69)
Use internally generated signals (page 88)
Fade out to black (page 93)
When mix or
preset color mix
is selected
Advanced operations
Advanced effect operations
(page 95)
a)
Advanced key operations (page 104)
Select video (page 49)
a)Some patterns cannot be modified in
this way. For details, refer to “Effect
Pattern Transformations and
Modifications” in the Appendix
(separate document).
Change the position and size of the effect pattern (page 63)
a)
Color correction (page 111)
Frame memory (page 119)
Snapshots (page 124)
Macros (page 127)
Safe title (page 134)
Copying (page 135)
Select the transition type (page 53)
Select the operating channels (page 61)
Modify the video border (page 66)
a)
Execute the transition (page 73)
Compose video by keying (page 76)