Lindy MC5-IP manual Remote user video compensation, To display a suitable high contrast image

Remote user video compensation

Video compensation for each remote user is provided by their User Station modules, not by the MC5 unit itself. Using the User Station controls you can adjust the picture sharpness and brightness to improve the remote picture quality.

Note: Accurate remote user compensation relies upon visual feedback from the screen image. It is therefore vital to ensure that the video images being sent out from the MC5 are as ‘true’ as possible. Ensure, using the local user port, that the video images received from the computers are correctly compensated BEFORE attempting to adjust the remote user(s).

Video compensation is best carried out when viewing high contrast images with vertical edges, such as black lines on a white background. When doing so, if you notice that the screen image is ‘fuzzy’ or ‘dark’ then the image controls may not be able to solve this condition.

Note: If the high contrast images exhibit shadows with separate colours, then there may be a skew problem which requires a different image adjustment (provided only by User Station C5 Pro modules) - see the Remote user skew adjustment section for details.

To display a suitable high contrast image

The best way to clearly view the effect of sharpness and brightness adjustments is to display a high contrast image, with vertical

edges, on the screen.

To apply remote user video compensation

1Ensure that the video image from the computer to be used has been correctly compensated. See Computer video compensation for details.

2On the remote user keyboard (connected to a User Station extender),

simultaneously, press the hotkeys (by default, and ) along with to enter configuration mode.

The three keyboard indicators (‘Num Lock’, ‘Caps Lock’ and ‘Scroll Lock’) will now begin to flash in sequence. The speed of the sequence indicates the level of the sharpness adjustment currently applied: the slower the rate, the lower the level of sharpness being applied.

3While viewing the displayed screen image, use the following keys to adjust the controls:

Sharpness: for fine adjustment, for coarse adjustment.

There are 255 sharpness levels (one coarse step jumps 10 levels).

To autoset sharpness: Press to make the module calculate and apply an automatic compensation level - you can use this as a starting point for your fine tuning.

Note: If the monitor goes blank and switches off (due to oversetting the sharpness adjustment) press the Home key to restore.

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•Open a word processor, type the capital letter ‘H’, or ‘M’ and increase the point size to 72 or higher. For best results, the background should be white and the character should be black.

•A BLACK shadow on the right of the character indicates UNDER compensation.

•A WHITE shadow on the right of the character indicates OVER compensation.

High contrast black character on white background

Black or bright white shadow on the right indicates

the need for sharpness adjustment

Brightness: for adjustment. There are 255 brightness levels.

Restore default	Sharpness
	increase
sharpness and	(coarse)

brightness	Sharpness
settings
	decrease
	(coarse)
Exit image	Sharpness
	increase
controls	(fine)	Brightness
and save		increase
settings

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Note: The Word processor method is accurate and quick. However, for the very finest video compensation, use the latest “skew” test pattern program which shows both the skew pattern and a section of mixed size Hs (black on white and white on black).

If the image controls cannot provide a crisp image

If, after adjusting the image controls, one or more screen images remain fuzzy or have coloured shadows you may need to use the Skew adjustment feature. Please see Remote user skew adjustment for details (User Station C5 Pro module only).

	Sharpness
Brightness	decrease
decrease	(fine)

4When no shadows are visible and the displayed images have crisp edges,

press to exit configuration mode and permanently save all settings.

The new compensation settings will be stored, even when power is removed or if a complete reset is initiated. These settings should not require further changes unless the cabling arrangements are altered.

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