Epiphan VGA Printer - Manual (Page 49)

4. VGA Printer Web admin interface Configuring VGA2USB Adjustments
User Guide Page 49
PLL
adjustment
Configure PLL to adjust the vertical
synchronization properties of the image. The
PLL adjustment may need to be changed when
there is a repetitive distortion or blurriness on
the horizontal axis of the image. You can adjust
the PLL setting in small steps until a sharper
image is displayed.
Offset and
Gain
Use the offset and gain controls together to
optimize image quality. Increasing gain
amplifies weak signals but also increases noise.
Increasing offset reduces background noise but
also reduces the overall signal.
Balance offset and gain to achieve the best
quality image. You should adjust these settings
by the smallest values possible to achieve the
best results. You can compensate for a large
change to one by making a large change to the
other, but setting both offset and gain to high
values can result in poorer video quality.
Aspect
Ratio
Set the aspect ratio of the captured image. The
default aspect ratio is 4:3. You can change the
aspect ratio to wide mode so that the device can
accurately capture wide aspect ratio VGA
modes.
It's not always possible for the Epiphan device
driver to distinguish between video modes when
they have the same number of rows, for
example, 1024x768 and 1280x768. You can
change the aspect ratio to Wide Mode if you
want the driver to choose wide video mode in
these situations.