FOR-A HVS-12ROUA, Installation And Operation Manual

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5-10. Chromakeys
5-10-1. Chromakey Setup Flow
Chromakeys differ from regular keys in that the key is cut based on ignoring a certain color
rather than signal levels. For example, if blue (the normally used back drop color in
chromakey studios) is used, all blue areas in the source video are removed and video (CG or
other picture) can be inserted to the areas where the blue previously appeared. In the
HVS-3800 series switchers KEY1 and KEY2 support chromakey operations.
The following flow charts give general operational flow procedures when making and
adjusting chromakey.
The following section shows an example of creating a chromakey with the KEY1 AUTO
CHROMAKEY menu and then using the MANUAL CHROMAKEY menu to make
adjustments.
Chromakey Flow Example
Adjust clip and gain levels as needed
After all above steps are completed, adjust for color cancellation,
suppression in the keyer menu, if necessary.
If best results not obtained, in the
keyer menu, manually readjust HUE,
ANGLE and/or ANGLE OFFSET
parameter settings
In the keyer menu, set SELECT to
ON to apply auto chromakey.
Move the crosshair to select the color
to be ignored viewing the image on
the preview output (POSITION-X-Y).
In the keyer menu, adjust HUE,
ANGLE and/or ANGLE OFFSET
parameter settings until best possible
signal results are obtained.
Transition key to appear on PREVIEW output to check results / adjust
Select KEY SOURCE/INSERT signals using AUX/KEY bus or keyer menu.
Select a background signal using PGM/PST bus.
When Manual Adjusting When Auto Adjusting
In the keyer menu set TYPE to CHR.