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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.

The following figure shows a typical flow of operations when using the MFS-
2000 system. For details about operations, see the pages in parentheses ( ).

: Always done

: Done as required

: Done at this stage

Select an effect 

Prepare the transition 

Use internally generated signals 

Fade out to black 

When mix or 
preset color mix 
is selected

Advanced effect operations 

Advanced key operations 

Select video 

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 

Color correction 

Frame memory 

Snapshots 

Macros 

Safe title 

Copying 

Select the transition type 

Select the operating channels 

Modify the video border 

 a)

Execute the transition 

Compose video by keying