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Chapter 6 Chroma and Luma Keys
Keying is a special filter that the TVS-1200A uses to remove a specific color (e.g. Green) from
the image by applying the filter to the input CAM. CH/L Key 1 applies the filter to the input
CAM 1 and CH/L Key 2 applies the filter to the input CAM 2. In this way, for example, talent on
a green backdrop can be placed on any virtual background after chromakeying is enabled. The
TVS-1200A system supports three keying modes: Chroma Key, Simple Chroma Key and Luma
Key.
o Chroma Key Mode – This function enables the TVS-1200A to be used for chromakeying.
Camera input is fed with object on a green or blue backdrop. Background is generated by
PC or any other media sources.
o Simple Chroma Key Mode – This function enables the TVS-1200A to be used for simple
chromakeying by performing quick settings of matte, shadow, despill and garbage mask.
o Luma Key Mode – This function enables the TVS-1200A to be used for luminance-based
keying. Camera input is fed with object on a black or white backdrop. Background is
generated by PC or any other media sources.
To ensure the best quality, the keying function has a number of parameters available for the
user to set the optimal keying. The subsections below outline the Chroma Key configuration
process in detail.
6.1
Key Selection
Click on the button
6.2
Chroma Key
After selecting the desired key mode, the next step is to select the colour to be keyed out.
Clicking on the chrominance keyer button
the diagram below. This setting depends on the keying background used. There are two
possibilities: green or blue. The choice is made by clicking on Background Color in the
Chrominance Keyer section.
to select the desired key mode as depicted in the diagram below.
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to enter the configuration screen as shown in
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