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Operation, cont’d
IN1404XT Video Scaler and Switcher • Operation3-26
Vertical
Blanking
Horizontal
Blanking
Active Area
Active Blanking Area
Figure 3-15 — Incorrectly blanked image
Similarly, if the vertical blanking adjustment is set to less than the amount of actual
blanking, the IN1404XT starts scaling before the first line of the active image. This
early scaling results in a blank border on the top and cropping on the bottom, and
looks as if the image is shifted down.
Press the
and buttons to shift the blanking period vertically on the screen.
Press the and buttons to shift the blanking period horizontally on the screen.
Press the Enter button to save the changes and return to normal system operations.
If improperly adjusted, the output position variable can result in an indication
similar to figure 3-15. But, position only 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 can be caused by the image being
improperly positioned on the monitor. You can use the blue screen feature as a tool
to help you adjust the monitor’s controls. The blue screen is always available, even
when the input settings are incorrectly adjusted or there is no input signal. 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 then can be adjusted.
Active area adjustment
Figure 3-16 shows an image whose active area is improperly set, as indicated by the
dashed lines. If the number of active image pixels that the scaler is set to scale are
less than the amount of actual active pixels that are input, the IN1404XT only scales
the set active area and will skip some of the input pixels. This early end to the
scaling process results in an output with fewer pixels than it should, and looks as if
the image is stretched horizontally.