English Manual
LINDY KVM Extender C5 PRO-300 Installation and Use
page 20
5.7 Video compensation, Image controls - sharpness and brightness
The Extender C5 incorporates 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 effects of compensation is to display
a high contrast image, with vertical edges, on the screen.
•
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.
To use the image controls
1. Simultaneously, press the hotkeys (by default, <CTRL> and <SHIFT> along with <RETURN>) 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.
2. While viewing the displayed high contrast screen image, use the following keys to adjust the controls:
Sharpness:
User
CURSOR UP
and
DOWN
for fine
adjustment, and
PAGE UP
and
DOWN
for coarse
adjustment.
There are 255 sharpness levels (one coarse step
jumps 10 levels).
To autoset sharpness: Press
<F> <2>
<RETURN>
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.
Brightness:
User
CURSOR LEFT
and
RIGHT
for adjustment.
There are 255 brightness levels.
3. When no shadows are visible and the displayed images have crisp edges, press <RETURN> 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.