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CG (LUMA KEY) function
The HS-600 has the ability to LUMA KEY. This means it is able to take a key source video input, either Composite
or DVI, and replace the white or black parts of this image with the video from another source.
It is also possible with the HS-600 to keep the pure white and black parts of the key source image and only key
video using the greyscale part in between pure white and black.
If the key source image only needs to be partially transparent, maybe to create a video watermark effect, then this
can be set up quite easily too.
It is also possible to define a Window Matte using X and Y screen co-ordinates. The part of the key source image
occupying this defined matte area is then keyed out to show the selected video source behind it.
Luma Key Setting
Before trying to activate the LUMA KEY function its best to understand how to set up or choose the right options for
your set up well in advance of the production.
Press the LUMA KEY SETTING Key in the EFFECTS area of the HS-600 keyboard. This is a short cut key that
allows you to get to the Luma Key menu settings quickly. When this key is pressed you will see a LUMA KEY
SETTING Menu appear in the Multi-Image Preview in-between the PST and PGM images. The LUMA KEY options
provided here are:
[LUMA KEY SETTING]
1: SOURCE = CH_8
2: KEY LEVEL MAX. = 240 (OFF WHITE )
3: KEY LEVEL MIN. = 20 (OFF BLACK )
4: TRANSPARENT PT. = 20 W [ ]
B
5: TRANSPARENCY = 0
6: WINDOW LEFT_TOP = X=000 , Y=000
7: WINDOW RIGHT_BOTTOM = X=720 , Y=576
ESCAPE
Choose your LUMA KEY sources
The
Background video
shown behind or through the KEY SOURCE image is the currently chosen input on the
MAIN SOURCE row of buttons. This background video can be any source selected between CH1 and BG.
The
LUMA KEY source
is chosen using option
1: SOURCE
as shown in the LUMA KEY SETTING menu above.
This
is the chosen image that will be affected by the other luma key options within the LUMA KEY menu.
KEY level and Transparency
Option
2 : KEY LEVEL MAX
- sets the upper parameter for the key.
Option
3 : KEY LEVEL MIN
- This sets the lower parameter for the key.
The range between the MAX and MIN values determines how many mid tone (greyscale) colours are keyed. The
smaller the range the fewer the colours keyed out.
Typical settings for an overlay where you only want to remove a black background would be:
Key Level Max = 50
Key Level Min = 0
5. TRANSPARENCY
- This sets the transparency level of the remaining overlay. Zero (0) being solid overlay and a
higher number making the overlay less solid so the video behind shows through.
