User guide

3.2 Adjusting Bengal To Its Source
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3.2.1 Adjusting to Computer Sources
The best way to adjust levels is the semi-automatic method.
Adjusting levels semi-automatically
This is quick and easy if you can get a black pic-
ture and a white picture from the source computer.
1. Display a black picture from the source. This
must come from the computer source that will be
used for the program. It does no good to use your
laptop for this adjustment, then connect to a dif-
ferent computer for the program. Nor can you use
the Bengal black test pattern. (Hint: Make a black
screen from Windows Paint program.)
2. In the
INPUT LEVELS menu, select AUTO BLACK LEVEL
and press
ENTER.
3. Display a white picture from the source.
4. Select
AUTO WHITE LEVEL and press ENTER.
That’s all there is to it. The Bengal is now adjusted to
the black and white levels of this computer using this
video card. If you change computers or video output
cards in the computer, you must do this again.
Adjusting levels manually
1. Display an all-black picture from the source com-
puter.
2. Press
PICTURE on the remote to open the PICTURE
menu.
3. Select LEVEL at the bottom of the menu.
4. Select
BLACK LEVEL and adjust it up and down with
the +/– keys to make the three
CENTER POINT values
go to zero. If they do not all touch zero at the
same time, use the individual colors under
BLACK
LEVEL to adjust them.
. Do not go beyond the point where the Minimum just
goes to zero. The idea is to just touch the zero level.
5. Display an all-white picture from the source com-
puter.
6. Select
WHITE LEVEL and adjust the levels until the
CENTER POINT values just touch 255, adjusting the
individual colors as necessary.
 It is not a good idea to use the levels to make the
displays match each other. That should be done with
the
COLOR BALANCE menu. (3.4 “Color Balancing
Bengal” on page 38).
Adjusting levels completely automatically
Open the
AUTO SETUP OPTIONS menu and check DO
BLACK/WHITE LEVELS. You can check the other items, too,
particularly
FREQUENCY and PHASE.
Now press
SETUP. Bengal looks for the darkest pixel
and the brightest pixel in the picture and adjusts
itself so that these are the truly the darkest and
brightest.
When the
BLACK/WHITE LEVELS item is checked, the
Bengal will do this automatic level adjustment when-
ever a completely new source is displayed.
What is a “completely” new source?
Bengal remembers all the values in the last 10 pic-
tures. If a new picture comes from a different source,
such as from a different computer, and that picture
has almost exactly the same resolution, number of
active lines, number of blanking lines, etc., the Ben-
gal will assume that this is a source it has seen before
and use the remembered setup values. This is a dif-
ferent sort of memory from the 40 numbered memo-
ries described in 3.6 “Saving Your Work and Recalling
a Memory” on page 42.
On the other hand, if the new source is sufficiently
different, Bengal will engage all the checked processes
in the
AUTO SETUP OPTIONS menu.
When a saved memory is recalled from the
RECALL
menu, Bengal does not do any auto setup.
Which is best: Manual, Semi-Auto, or Auto
The manual and semi-automatic methods are
more accurate. The automatic method works well for
the
BLACK LEVEL, but it is sometimes not accurate
enough for the
WHITE LEVEL.
The good news is that you should only have to do
the manual or semi-auto method once for each com-
puter source. Save these settings in the
SAVE menu,
See “Memory: Save” on page 69 Then use
RECALL to
instantly bring it all back..
When to re-adjust levels
You should re-adjust black and white levels when-
ever:
• the computer is changed.
• the video card in the computer is changed, or you
switch the source for this display to a different
video card output in the same computer.
• you change the electronics module.