Vertical Stretch - Runco Video Xtreme VX-40d Owner's Operating Manual

Section 3: Operation
• Select "ANAMORPHIC" to display an anamorphic image
in its native 16:9 aspect ratio. The image will fill the screen
from side-to-side and be centered between black bars at
top and bottom.
• Note: If using a 16:9 screen, you may have to go to the
'Anamorphic' mode after performing an auto setup.
Size
"Size" controls both the image width and height in tandem, maintaining the current aspect
ratio (proportion) of the displayed signal data.

Vertical Stretch

"Vertical Stretch" adjusts the height of the image while keeping the width constant. Use
"Vertical Stretch" to change the aspect ratio of the display.
Pixel Track
Steady flickering or several soft vertical stripes or bands across the entire image indicates
poor pixel tracking. Proper pixel tracking helps ensure that the image quality is consistent
across the screen, that aspect ratio is maintained, and that pixel phase can be optimized
(described below). Tracking determines the frequency of the pixel sampling clock, indicated
by the number of incoming pixels per line, so that all pixels generated by a particular
source are sampled.
NOTE: By default, the projector samples at the correct frequency for most sources.
For best results, use a good test pattern such as a smooth gray consisting of a clear
pattern of black and white pixels, or a similar "half on, half off" graphic image, such as
the Windows shutdown screen. Adjust the slidebar until the vertical stripes broaden to
the point where one large stripe fills the image. If the image still exhibits some shimmer or
noise, adjust Pixel Phase (below).
Pixel Phase
NOTE: Adjust "Pixel Phase" after "Pixel Tracking".
Adjust pixel phase when the image (usually from an RGB source) still shows shimmer
or "noise" after pixel tracking is optimized. Pixel phase adjusts the phase of the pixel
sampling clock relative to the incoming signal.
For best results, use a good test pattern such as a smooth gray consisting of a clear
pattern of black and white pixels, or a similar "half on, half off" graphic image, such as the
Windows shutdown screen. Adjust the slidebar until the image stabilizes and each pixel is
clearly defined. You may notice that you can stabilize the image at more than one point—
i.e., you may find that the image appearance at "11" is identical to the image appearance
at "38", thus you can use either setting.
If some shimmer from a video or HDTV source persists, use the "Filter" control to remove
high-frequency noise from the signal. See Image Settings.
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