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5.3
Secondary Functions
1. Color Background
With the color background generation function, a solid color
image
filling the
screen
is generated
purely
electronically
without using a camera, and this can be used as one of pictures
handled by the KM-1200.
The COLOR
switch on the control panel allows the selection
of one of the eight colors:
BLK
(black), B (blue), R (red),
MG
(magenta),
G
(green),
CY
(cyan),
Y
(yellow)
and W
(white).
By selecting the 5/COLOR
button of each bus line, the color
picture selected can be used as the 5th input.
Note:
@
In the Ext. Genlock mode in which gen-
lock
signal
is used
as the 5th
picture
image,
the
color
background
function
cannot be used.
2. DSK (Downstream Keyer)
With this function, character or graphic images shot by a B/W
camera can be added to the EFF output. These monochrome
characters and graphics can be provided with a color by using
the colorizer function.
®
Connect a color monitor to DSK PREVIEW or PREVIEW
OUTPUT, and press the PREVIEW bus-line button "DSK"'.
® To the DSK
input connector,
supply signal from a B/W
camera or character generator.
[1] Adjust the SLICE and LEVEL controls so that color pic-
ture
is observed
on
the
DSK
PREVIEW
or
PREVIEW
monitor.
Set the required color using the DSK COLOR switch.
LEVEL
COLOR
SLICE
ON/OFF
(3] Set the DSK
button to "ON" so that the DSK signal is
inserted in the PGM output.
Note:
@ When the characters and graphics inserted with DSK have
high color saturation, dots may be observed at the edges
because of the interference of color subcarriers. This is due
to the operating principle of color TV itself and is not a
malfunction.
3. Keying (CHROMA
KEY/EXT KEY)
The KM-1200
incorporates a chroma key signal generator so,
by supplying
R/G/B
signals to the CHROMA
KEY
INPUT
R/G/B
connectors,
chroma
keying
is possible with a blue
background.
When video signal (positive polarity) of characters or graphics
shot by a B/W camera such as a title camera is input to the
CHROMA
KEY
INPUT B connector, keying of A and B bus-
line pictures is possible using that signal.
Chroma
keying and Ext. keying cannot
be performed at the
same time.
1) Chroma keying operation
@ Set the MODE select button to ''MIX''.
@
Supply
the
video
signal
from
the
color
camera
for
chroma
keying (hereafter referred to as key camera) to
one of the COMPOSITE VIDEO INPUT connectors.
@ Set the CHROMA
KEY ON/OFF button to "OFF".
CHROMA/EXT
KEY
DELAY
SLICE
© ©:
(1 Set the PREVIEW bus-line button to "EFF".
(2] Slide the MIX/WIPE lever to "A".
Press the INPUT-A bus-line button corresponding to the
input from the key camera.
ON/OFF
Blue background
[4] With the key camera, shoot the
desired object using a blue back-
ground.
INPUT-A
(Key camera)
[5] Slide the M!X/WIPE lever to "B".
(6) Press the INPUT-B bus-line but-
ton corresponding to the picture
that you want to insert over the
blue background shot by the key
camera.
Set the CHROMA KEY ON/OFF
button to "ON".
Adjust
the
SLICE
contro!
so
that clear picture is observed on
the preview monitor.
[8] Adjust
the
DELAY
potentio-
meter
so that the contours
of
the inserted picture are clear.
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