Electrohome VistaGRAPHX 2500, User Manual

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OPERATION
VistaGRAPHX 2500 User's Manual
3-18
Figure 3-9. Size / Position Menu
Horizontal Position
(
SHORT CUT:
from presentation level.)
Moves picture right and left.
NOTE: The number on the slidebar represents where the approximate center of
the image lies in relation to the total number of pixels available horizontally and
varies widely according to the signal. Watch the image while adjusting.
Vertical Position
(
SHORT CUT:
from presentation level.)
Moves picture up and down.
NOTE: The number on the slidebar represents where the approximate center of
the image lies in relation to the total number of lines available vertically and
varies widely according to the signal. Watch the image while adjusting.
Pixel Tracking
(SHORT CUT:
from presentation level. Or use the Pixel Track key.)
Adjusts the frequency of the pixel sampling clock, indicated by the number of
pixels per line, so that all pixels generated by a particular source are sampled.
Proper pixel tracking ensures that the image is of the correct proportion and not
stretched or compressed from left-to-right.
NOTE: By default, the projector samples at the correct frequency for a given
source. For best results, it is recommended that this default not be overridden.
Adjustment of pixel tracking is done most effectively from within a good 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. Steady flickering or several soft vertical