Specifications

F. How to Use the Video Tuning Menu
This menu is used to fine-tune the video picture.
Auto Everything: use this 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: it 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: it 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.
Color Offset: it is a fine tuning adjustment that requires the use of a test pattern. There is a copy of
the test pattern available on the Help! menu of the integrated web server. You must arrange for that
image to be shown on the host computer(s). Do not allow scaling, cropping or any other changes to
that image. Press the Auto button and the system will calibrate color for the best possible picture in
approximately one minute. If the system cannot find the test pattern on the screen, it will say so.
Check that the pattern isn't scaled or covered up. It's important to do this operation in 24-bit or 32-bit
color video mode (i.e. true color). Although the algorithm may work in 16-bit or 8-bit color video modes,
the results will not be optimum and usually it won't be able to recognize the test pattern.
Advanced: press this button will open the Advanced Video Tuning menu. While the vast majority of
users will not need to adjust these settings, it offers a high-degree of control of the video settings of
your VNC sessions.
Sampling Phase: it does not normally need to be used since our system tunes the sampling phase
whenever the video mode changes. This button does not require a test pattern, but will perform
optimally when used with our standard test pattern. For your reference, the sampling phase number is
shown to the right of the Filtering button.
Noise Filter: it controls the advanced video filtering of our system. Unlike other filtering algorithms, our
noise filter will only remove noise. It does not degrade the signal quality or readability of small text.
You may turn it on and off using the indicated button, or set it to other values using the arrows. Higher
numbers cause more filtering and may cause artifacts when moving windows. The most common
visual artifact is a vertical line dropping when moving windows horizontally. You may use the Redraw
button to correct these, or use a lower filter number. At minimum, these values must be greater than
two.
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