Operation, cont’d
Vertical |
Blanking |
Active Blanking Area |
Active Area |
Horizontal |
Blanking |
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.
3-26 IN1404XT Video Scaler and Switcher • Operation
