Epiphan VGA2USB Pro - Manual (Page 140)

18. Advanced topics Configuring image adjustments
Page 140 Epiphan Frame Grabber
Figure 40:PLL adjustment
A good indication that the PLL setting needs to be adjusted is
when there is a repetitive distortion or blurriness on the
horizontal axis of the image as shown in Image C and Image D
above.
Horizontal and Vertical Shift
Using the horizontal and vertical shift adjustments you can offset
the image position on the screen. For example, Image E in
Figure 41 shows a captured image shifted slightly to the right
(horizontally) and slightly downward (vertically). To correct the
image position, minor adjustments to these settings are necessary.