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3.2 Adjusting Each Margay To Its Source
44
3.2.1 Adjusting to Computers, Analog RGB
3.2.1 Adjusting to Computers, Analog RGB
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 Margay’s black test pattern. (Hint: Make a
black screen from Windows Paint program.)
2. In the M
ANUAL LEVELS menu, select Auto Black
Level and press
ENTER. (There are several paths to
the Manual Levels menu as shown in the pic-
tures.)
3. Display a white picture from the source.
4. Select A
UTO WHITE LEVEL and press ENTER.
That’s all there is to it.
The Margay 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 com-
puter, you must do this again.
Adjusting levels completely automatically
Open the A
UTO SETUP OPTIONS menu and check
D
O BLACK/WHITE LEVELS. You can check the other
items, too, particularly F
REQUENCY and PHASE.
Now press
SETUP. Margay 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
Margay will do this automatic level adjustment
whenever a completely new source is displayed.
What is a “completely” new source?
Margay 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 Mar-
gay 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 “Using the Memories Efficiently” on
page 78.
On the other hand, if the new source is sufficiently
different, Margay will engage all the checked pro-
cesses in the Auto Setup Options menu.
When a saved memory is recalled from the Recall
menu, Margay 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 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,
“How to Save to a Memory” on page 80. 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 cube to a different video
card output in the same computer;
you change the electronics module.
Adjusting to computer sources manually
See “Adjusting Input Levels Manually” on page 46.