Extron Electronics IN1508 User Guide - Manual (Page 48)

Active Pixels and Active Lines status indicator bars
Figure 33 shows an image whose active area is improperly set, as indicated by the dashed
lines. If the number of active image pixels that the switcher is set to scale are less than the
amount of actual active pixels that are input, the IN1508 only scales the set active area and
skips some of the input pixels. This early end to the scaling process results in an output with
fewer pixels than it should have, and looks as if the image is stretched horizontally.
Incorrect Active
Pixels setting
Incorrect
Active
Lines
Setting
Incorrect Active Area
Portion of the Image
Visible on IN1508 Output
Active Area Omitted on IN1508 Output
Blanking Area
Figure 33. Incorrect Active Area Setting on Frame of Video Input
Similarly, if the number of active image lines that the IN1508 is set to scale is less than the
amount of actual active lines that are input, the IN1508 scales only the set active area and
skips some of the input lines. This early end to the scaling process results in an output that
has fewer lines than it should have, and looks as if the image is stretched vertically.
Depending on the RGB source, the input sampling rates in the following table may have the
same horizontal scan rate and vertical refresh rate. The switcher does not detect total pixel
differences (you can have different numbers of pixels in the same horizontal and vertical
rates) between input rates. The switcher applies the default values for the detected input
frequency.
Adjust the Active Pixels status indicator bar to increase and decrease the number of active
pixels, shifting the ending period horizontally on the screen. Adjust the Active Lines status
indicator bar to increase and decrease the number of sampled lines.
IN1508 • Operation 43