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6.9 Making Test Patterns With "Paint"
To adjust the display to the computer you need three signals: Black, White, and a special 50% gray pat-
tern. You can make these with the Windows Paint program.
When you connect a Clarity display to a computer
source, you must make four adjustments in the dis-
play electronics:
• Black Level
• White Level
• Frequency
• Phase
It is easy to make these adjustments, but they
must be made with signals coming from the source
computer. Not just any computer, but the actual com-
puter that will be used as the content source.
To adjust the Black and White Levels, the com-
puter must generate a pure black and a pure white
signal. To adjust Frequency and Phase, the computer
must generate a signal in which alternate pixels are
black and white. The screen will look gray, but it is
not the same as making all pixels gray.
These three signals are easy to make with the Win-
dows Paint program. This is how to do it.
1. Open the Windows Paint program. Click on
Start, Programs, Accessories, Paint.
2. Click Image on the menu bar.
3. Highlight Attributes and press Enter.
4. Set the Width and Height to SVGA (800 and
600) or to VGA (640 and 480).
5. In the Attributes dialog box, select the "Black
and white" button. Click OK.
6. A warning box appears. Click Yes.
7. Click the "fill" tool, which looks like a paint
bucket spilling paint. The cursor will now be
this spilling bucket when it is over the paint
window, the area in the middle of the screen.
8. At the bottom of the screen, click the Black
square. This is the left square on the top row of
black and white boxes.
9. Click somewhere in the center window. It will
become black.
10. Click File, Save. Name the file BLACK.BMP.
11. Click the White square at the bottom of the
screen. This is the left square on the bottom
row of black and white boxes.
12. Click somewhere in the middle of the screen.
The screen will become white.
13. Click File, Save As. Name the file WHITE.BMP.
138
14. In the bottom row where you picked the White
square, count this White square as square num-
ber 1. Count over to the 9th square and click it.
15. Click somewhere in the center widow. It will
become gray, but this gray will be a pattern of
alternating black and white pixels.
16. Click File, Save As. Name the file CHKR-
BORD.BMP , for Checkerboard.
You can now use these three patterns to adjust Black
and White Level with the black and white screens,
and Frequency and Phase with the CHKRBORD pat-
tern.
To use these signals, start the Paint program. Click
File, Open, and choose one of the signals. To make
the signal fill the entire monitor, press Ctrl-F. Return
to the Paint screen by pressing Enter.
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