3.2Adjusting Each Margay To Its Source
3.2.1Adjusting 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 MANUAL 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 AUTO 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 AUTO SETUP OPTIONS menu and check DO BLACK/WHITE LEVELS. You can check the other items, too, particularly FREQUENCY 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,
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
When to re-adjust levels
You should
•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.
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