Vidikron 140/150 - Manual (Page 64)

Installation
52 Vision Model 140/150 Owner’s Operating Manual
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For 1080i digital and 1080p signals, channels are pre-configured at the Vidikron factory for
each aspect ratio. These channels use Custom size presets to achieve the selected aspect
ratio.
• “Custom” Resizing: The “Custom” re-size descriptor automatically appears in the Size
and Position menu when any of the values for Size, Height, Horizontal Shift, Vertical Shift
or Blanking do not correspond to those for a preset. This option is not offered in the Size
Presets pull-down list.
Other resizing options are described below, for the sake of completeness. In actual practice,
though, they are rarely (if ever) used when the Vision 140/150 is used with the VHD
Controller.
• Default Resizing: When you select a new source, the image utilizes as much of the
projector’s display area as possible for the type of incoming source data, but with minimal
or no changes to aspect ratio. The image will be centered and displayed as large as
possible depending on the source type and projector model:
• A video image or 4:3 graphic image is enlarged to fill the screen height, centered
between black side bars.
• A 5:4 graphic image is enlarged to fill the screen height and is centered between black
side bars.
• An anamorphic (16:9) image fills the whole screen.
• Full Size: Select Full Size to use all pixels for displaying the image, regardless of source or
original aspect ratio. Incoming source material having a different aspect ratio than the
projector will be stretched to fill the display.
• Full Width: Select Full Width to fill the projector’s display from left-to-right without
changing the original aspect ratio of the image. Depending on the source, data at the top
and bottom may be discarded (cropped), or the display may have black borders at the top
and bottom (called “letterbox”).
• Full Height: Select Full Height to fill the display from top-to-bottom. Depending on the
source, this may create borders.
• Anamorphic: Select Anamorphic to display an anamorphic image in its native 16:9 aspect
ratio. The image will fill the whole screen.
Size: “Size” controls both the image width and height in tandem, maintaining the current
aspect ratio (proportion) of the displayed signal data.
Height: “Height” adjusts the image height while keeping the width constant. Use this setting
to change the aspect ratio of the display.
Pixel Tracking: 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 (see 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.
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. 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 (described below).