Sony BRS-200 - Manual (Page 91)

91
Using the Downstream Key (DSK) to Add Characters or Graphics
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If “DSK CLN” is set to “On” on menu page 933, the composite DSK video is
not displayed in the preview window. Set “DSK CLN” to “Off” (page 96).
When a transition is complete, the composite video disappears from the preview
window even if “DSK CLN” is set to “Off.”
To use a monochromatic image (color matte) as a DSK FILL video
1
Display menu page 750.
2
Turn the F1, F2 and F3 controls to adjust “LUM” (luminance), “SAT”
(saturation) and “HUE” of the monochromatic image.
3
Turn the F4 control to set “FILL” to “On.”
When the DSK transition is executed, the adjusted monochromatic image is
composed as a DSK FILL video.
Composing Video Using the Chroma Key
A video is created by detecting a specific color component (chroma) to cut a
portion from the DSK FILL video. This method is referred to as “chroma key.”
Generally, a subject is shot with a blue background, the background that
contains blue component is cut out, then only the subject is superimposed on a
background video.
In the example below, only a figure cut from the DSK FILL video is composed
with the background video.
Basic operation of chroma keying
The switcher is provided with two methods for setting the chroma key.
• to set the chroma key automatically, specifying the color by moving the cursor
displayed in the preview window with the joystick
• to set the chroma key manually by menu operation
You can also adjust the chroma key manually after specifying it with joystick
operation.
Note
DSK LUM SAT HUE FILL 5/6
MAT 0.0 0.0 0.0 Off 750
Background video DSK FILL video
Blue background
Chroma key composition