Adder Technology X2 manual Image controls sharpness and brightness, To use the image controls

Image controls - sharpness and brightness

The X2 Dual Access modules incorporate special controls to compensate for losses incurred within long cable links. Using these controls you can adjust the picture sharpness and brightness to improve your remote picture quality.

The need for image control adjustment is best discovered 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 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 - see the ‘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 use the image controls

1Simultaneously, 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.

2While viewing the displayed high contrast screen image, use the following keys to adjust the controls:

	Sharpness
Restore default	increase
	(coarse)
sharpness and
brightness



•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 or bright
black character	white shadow
on white	on the right
background	indicates
	the need for
	sharpness
	adjustment

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

	Sharpness
Brightness	decrease
decrease	(fine)

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 key to restore.

Brightness: for adjustment. There are 255 brightness levels.

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

       

If the image controls cannot provide a crisp image

If, after adjusting the image controls, the screen image remains fuzzy or has coloured shadows you may need to use the Skew adjustment feature. Please see the next section for details.

press	to exit configuration mode and permanently save all settings.
The new compensation setting will be stored, even when power is removed
or if a complete reset is initiated. The setting should not require further
changes unless the cabling arrangement is altered.

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