Color Space Selection
The iScan Pro can output video in one of two
different color spaces. The first is the Red-
Green-Blue (RGB) color space that is com-
monly used for projectors, displays and
monitors that are designed to accept com-
puter video output.
The second is Component Video, but is more
accurately called YPbPr though you may
hear it referred to as Y-Pb-Pr, YUV, Y-Cr-Cb or
Y/B-Y/R-Y (read "Y, B minus Y, R minus Y").
This color space is commonly used for
newer digital TV sets, displays and projec-
tors that are designed for use with Digital TV
(DTV) tuners.
You will need to determine which color
space is used by your progressively scanned
display and move the Color Space switch on
the front panel of the iScan Pro to the appro-
priate position.
UP
RGB
DOWN
YPbPr
Typically, inputs on display devices that are
labeled "Component Video", "DTV" or
"HDTV" are YPbPr whereas inputs that are
labeled "Computer" or "VGA" are RGB. Once
set up, this switch should not need to be
changed unless you are changing display
devices.
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Synchronization Signals
All video devices require one or more
synchronization signals that tell the device
when to start a new line and/or a new field.
For YPbPr devices, this sync information is
embedded in the Y signal.
For RGB devices, there are a variety of ways
that this sync information can be conveyed
and the iScan Pro can support most of
these. The iScan Pro generates separate H
(horizontal) and V (vertical) sync signals in
addition to the RGB outputs. This results in a
total of five signals (RGB/HV). For many
configurations, these five signals will be part
of a single VGA-to-VGA output cable and
there will be no need to worry about the
individual signals. For some devices you
may need to connect all five of these signals
to individual BNC or possibly RCA type
connectors. See Table 1 below for more
specific connection info.
Some display devices require that the two
H and V sync signals be combined into a
single "composite sync" signal, resulting in a
total of 4 signals (RGB/S). Devices requiring
composite sync typically accept the three
video signals as well as the composite sync
signal on BNC type connectors.
Other devices require that the composite
sync signal be further combined with the
RGB Green signal. This is referred to as
"sync on green" and is typically connected
to the device using 3 BNC connectors,
though 3 RCAs may also be used.
If your output device falls into either of these
last two categories – composite sync or
sync on green – the iScan Pro will need to
be internally configured to output the appro-
priate type of sync signal. To do this you will
need to follow the directions in Appendix A.
With YPbPr connections, the composite sync
is always combined with the Y signal. The
iScan Pro will automatically do this whenev-
er the color space switch is set to YPbPr. It
is not required to configure any of the inter-
nal jumpers for any YPbPr device.
Display Devices
Wire Color
RGB/HV
RGB/S(comp)
Red
R (Red)
R (Red)
Green
G (Green)
G (Green)
Blue
B (Blue)
B (Blue)
White (or Gray)
H (Horizontal)
C-Sync
Yellow (or Black)
V (Vertical)
no connect
Table 1: Wire Color Cross-Reference
YPbPr
Other
Pr
Cr or R-y
Y
Y
Pb
Cb or B-y
no connect
no connect
no connect
no connect
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