Extron Electronics IN1408 - Manual (Page 34)

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© 2002 - INLINE, Inc. IN1408 Operation Manual - V1.4 3/21/02 12:32 PM
Input Blanking Adjustment
In Figure 2, the input blanking is set incorrectly (as indicated by the dashed lines). If the H-Blanking
is set less than the actual H-Blanking, the IN1408 will look for the active area before it really occurs.
This results in a blank border on the left side of the active area, and cropping on the right side of the
active area. This gives the apparent effect that the image is shifted to the right. Similarly, if the V-
Blanking is set less than the actual V-Blanking, the IN1408 will again look for the active area before
it really occurs. This results in a blank border on top of the active area, and cropping on the bottom of
the active area. This gives the apparent effect that the image is shifted down.
Incorrect Blanking
H-
Bl
an
k
in
g
V-Blanking
Active Area
Active Blanking Area
Figure 2. Incorrect Input Blanking
Do not confuse input blanking with the output position. The input blanking adjusts where the
electronic scaling process takes effect, which may add blank borders or crop the active area if set
incorrectly. The input blanking and active area should be manually adjusted to match the input video
signal, framing the actual active area of the input signal.
The output position simply moves the image on the monitor. It does not add blank borders or crop
any part of the image. However, the apparent effect of blank borders and a cropped image may be due
to the image being incorrectly positioned on the monitor. The blue screen is available to adjust the
output image on the monitor. It as available at any time, even when the input settings are incorrectly
adjusted or the input signal is missing entirely. Use the blue screen to adjust the output settings
(resolution, refresh rate, size, position and sync format) and to verify the image on the monitor. The
video and input settings have no effect on the blue screen. Once the output settings have been
properly adjusted and verified on the monitor, the blue screen can be turned off, and the video and
input settings may then be adjusted.