OPERATION
VistaGRAPHX 2500 User's Manual
3-19
stripes or bands across the entire image indicates poor pixel tracking. Adjust the
slidebar up or down until the stripes broaden to the point where one large stripe
fills the image.
Pixel Phase
(
SHORT CUT:
from presentation level. Or use the Pixel Phase key.)
Adjusts the phase of the pixel sampling clock relative to the incoming signal.
Primarily used for adjusting RGB input.
NOTE: Adjust pixel phase after pixel tracking is properly set.
Adjust pixel phase when the image (usually from an RGB source) shows
shimmer or “noise”. Pixel phase adjustment is done most effectively from within
a proper test pattern, such as a smooth gray image made up of a clear pattern of
tiny black and white dots, or a similar graphic image. Adjust until the image is
stable and each dot is clearly defined. Using the numbers on the slidebar as a
guide, you will notice that you can actually stabilize the image at more than one
point—i.e., you may find that the image appearance at "11" is the same as the
image appearance at "38", thus you can select either setting.
Top, Bottom, Left or Right Blanking
(SHORT CUT:
—
from presentation level.)
Blanks (turns to black) the top, bottom, left, or right edge of the image so that
any unwanted information is hidden. Blanking may be required for any signal
that does not fill the 1024 X 768 pixels available on the VistaGRAPHX 2500.
(
SHORT CUT:
from presentation level.)
Resizing generates a separate submenu of controls as described below.
When to Use Resizing
Resizing allows you to increase or decrease the size of your image. You can
control the horizontal and vertical sizes independently to change the aspect ratio
of an image, and you can move the image to a specific area of the screen. Use
resizing in order to match your image precisely to the specific screen size and
aspect ratio (proportion) needed in your application.
How to Access & Adjust Resizing
The three sets of horizontal/vertical resizing controls plus a “Presets” option
reside in their own Resizing submenu (Figure 3-10). Access this submenu
through the “
Resizing
” pull-down list in the Size / Position menu.
Resizing
'
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