Image controls - sharpness and brightness
The Wizard extender 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. | |
17
