Datavideo SE-1200MU, Инструкция по эксплуатации

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8.3 Chroma Key Ctrl
The Chroma Key Ctrl parameters and
values are shown along the bottom of the
display. Two colour palettes, Main and
Chroma, are shown in the diagram.
The
Main
palette corresponds to values of
Key Acceptance and Key Lift . The Chroma
palette corresponds to the Color Spill
settings.
Key Acceptance is represented on the
Main Palette as a sector or area covering a range of hues or colours that closely match the background
colour to be keyed as set in Chroma Matte . The user can start with a value of 120 degrees and this value
can be fine-tuned up or down using the Key Acceptance depending on the setup of the green or blue
screen studio.
Key Lift is represented on the Main Palette as a line extending from the center point in the direction of
the
Key Acceptance sector
. This value affects the performance of the Chroma key in
dark or black areas
. If
the dark areas of the video are becoming too transparent, then applying more Key Lift may help
depending on the setup of the green or blue screen studio. This value can be fine-tuned up or down by
changing the Key Lift value.
Key Gain affects the performance of the Chroma key in light or white areas . If the light areas of the video
are becoming too transparent then applying more Key Gain may help depending on the setup of the
green or blue screen studio. This value can be fine-tuned up or down by changing the Key Gain value.
8.4 Color Spill
The Color Spill parameters and values are
shown along the bottom of the display
below. These settings are used to
control/remove any unwanted Chroma or
colour Spill from the background onto the
foreground subject. There are two sectors
drawn on the Chroma palette, one
represents the wider Chroma Acceptance
range and the narrower Chroma Suppress
range.
Chroma Acceptance
sets the amount of the available colour range or space that should be
Chroma
suppressed . Usually starting with a large value of 120 degrees should produce reasonable results. This
value can then be fine-tuned up or down using the Chroma Acceptance value depending on the setup of
your green or blue screen studio.
Chroma Suppress, when set to 0%, removes the hues or colours that lie only on the same axis as the
Chroma Matte Hue angle. This setting has the effect of removing Background colour spill, but keeping the
underlying hue. When set to 100% then all the Chroma values that are ‘captured’ within the Chroma
Acceptance Angle are suppressed to greyscale – i.e. they have their Chroma removed. Usually starting with
a value of 50% should produce reasonable results. This value can then be fine-tuned up or down using the
Chroma Suppress value depending on the setup of your green or blue screen studio.