Size; Vertical Stretch; Pixel Track; Pixel Phase - Christie M Series User Manual

3.5.2 Size

Controls both the image width and height in tandem, maintaining the current aspect ratio of the displayed
signal data.

3.5.3 Vertical Stretch

Adjusts the height of the image while keeping the width constant. Use "Vertical Stretch" to change the aspect
ratio of the display.

3.5.4 Pixel Track

Steady flickering or several soft vertical stripes or bands across the entire image indicates poor pixel tracking.
Proper pixel tracking ensures that the image quality is consistent across the screen, the aspect ratio is
maintained, and that the 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 test pattern such as a smooth grey consisting of a clear pattern of black and white pixels,
or a similar "half on, half off" graphic image, such as the Windows 2000 shutdown screen. Adjust the slide bar
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).

3.5.5 Pixel Phase

NOTE: Adjust "Pixel Phase" after "Pixel Track".
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.
Adjust the slide bar until the image stabilizes and each pixel is clearly defined. You may notice that you can
stabilize the image at more than one point.
If some shimmer from a video or HDTV source persists, use the "Filter" control to remove high-frequency
noise from the signal.

3.5.6 H-Position

Moves the image right or left within the area of available pixels.
NOTE: The value shown represents where the approximate center of the image lies in relation to the total
number of pixels available horizontally. This varies widely according to the signal; watch the image while
adjusting.

3.5.7 V-Position

Moves the image up or down within the area of available pixels.
NOTE: The value shown represents the approximate center of the image in relation to the total number of
pixels available vertically. This varies widely according to the signal; watch the image while adjusting.
M Series User Manual
020-100009-08 Rev. 1 (05-2013)
Section 3: Operation
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