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12. Chromakeys
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-1000 series switchers
optional KEY1 and KEY2 support chromakey operations.
12-1. Chromakey Setup Flow
Note that if you do auto composite a chromakey using the switcher’s auto adjust function, you
can still manually "fine adjust" chromakey parameters after the auto chromakey has been made
if necessary. The following flow charts give general operational flow procedures when making
and adjusting chromakey either manually or automatically.
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.
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