Operating Procedure - Korg Krossfour KF4 Manuel D'utilisation

Operating Procedure

1. Make the connections.
Connect the OUTPUT jack, the OUTPUT S-VIDEO connector, and/or the MONITOR OUT jack
of the krossfour to the input of the display device(s) - monitor, projector, etc.
Connect the output of the source devices (DVD players, cameras, PCs, etc.) to the INPUT jacks
of the krossfour.
Connect the AC adapter (included) to the DC 7V IN connector, and plug the other end into a
power outlet.
2. Turn on the power.
Turn the power switch ON.
3. Select and control the image output.
Use the INPUT SELECT keys to select an input source for each channel.
Slide the fader to the A side to output the source signal selected by the INPUT A SELECT keys.
Slide the fader to the B side to output the source signal selected by the INPUT B SELECT keys.
Select a different FADER CURVE setting to change the fader's operating characteristics.
4. Output a still image.
Press the HOLD key for either channel to freeze the channel's input signal and output this fro-
zen image as a still. Press the HOLD key a second time to return to normal output.
5. Output the selected background color from either channel.
Either channel can be set to output a black screen image or a white screen image. Choose which
Channel will output the background color, and press the currently lit INPUT SELECT key for
that channel. The key will start to blink, and the input signal will be replaced by the background
color selected by the MODE switch, either black (if the MODE switch is set to BK) or white (if
WH).
6. Creating Composite Images
Composite images (or "compositing effects") are special effects that combine two video sources
into one image - placing a toy dinosaur in downtown Chicago, for example. Generally, one
image is set as the background plate, and portions of the second image appear in the foreground
as an overlay.
There are two different ways to specify which portions of the foreground image will be keyed-
out, allowing the background image to show through. Chroma-key effects remove areas of the
foreground based on their color. Traditionally, the blue portions are removed, so a subject stand-
ing in front of a "blue screen" can be superimposed on any background. Luma-key effects rely
on removing the black, white or specific gray portions of the image based on their brilliance,
rather than color.
When using the krossfour in the Chroma-key (CK) or Luma-key (LK) modes, Channel A will
be used as the background plate, and Channel B will be used as the overlay, or foreground
image. Here's how. Select the source for the background image by pressing the appropriate IN-
PUT A SELECT key. Select the source for the overlay (foreground) image by pressing the ap-
propriate INPUT B SELECT key.
Use the MODE switch to select the type of compositing effect; either C-K (Chroma-key) or L-
K (Luminance-key). If you have selected C-K, the blue parts of the foreground image (Chan-
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