StarTech.com MATRIX SV3254DX4I - Manual (Page 44)

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Video Tuning Menu
Use the Auto Everything button to automatically fine-tune all three
adjustments. If the test pattern for Color Offset calibration is not present
on the screen, then the Color Offset adjustment is skipped.
Changes/frame
Indicates the number of 16x16 blocks of video that are being sent, on
average, for every frame of video. With a static image being displayed by
the server, this number will be zero (shown as -nil-). Moving the mouse,
for example, will cause the number to jump to about 2 or 3.You may use
this number to judge the picture quality as you adjust the controls on
this menu.
Picture Positioning
Affects the image position on your screen. If you see a black line on
either side of your screen, or at the top or bottom, you can use the
arrow buttons to shift the image in that direction. Pressing Auto does
the same thing for you automatically. Use Save to save the changes you
have made manually. Since this adjustment depends on the video mode,
separate values are stored for each video mode.