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- VGA Convergence Check Ver. 2.1
- ----------------------------------------------------------------------
-
-
- VGACC is a test-picture which will help you to evaluate the
- convergence of your VGA monitor. Convergence determines how
- accurately the 3 electron beams (red, green, blue) are are aligned.
- Misaligned electron beams result in fuzzy images and/or colored
- "shadows" around white images.
-
- The color white consists of all three beams fired up simultaneously,
- so white is the best color to use when you check the convergence of
- your monitor.
-
- Convergence errors usually get more pronounced in the corners of the
- screen, so you should pay extra attention there.
-
- For a real "acid" test, turn on high intensity white (upper case W) and
- check the lines up close. Any colored shades? There shouldn't be.
- Also check the text screen (T) for sharpness.
-
- The color bar is composed of 8 low intensity colors with high
- intensity borders, and 8 high intensity colors with low intensity
- borders. Borders are 1 pixel. There is 1 pixel of black between
- adjacent colors. Can you distinguish the border on all sides of
- all colors? How about the brown border around high intensity yellow?
-
- Move the color bar and text box around to check the various parts of
- your screen. Use the center circle to make sure that the aspect ratio
- of the screen is correct so the circle looks like a circle, not an
- ellipse. Make sure the picture is stable and has no line movements
- like "jitter" (<½ sek), "swim" (≈10 sek) or "drift" (>60 sek). Also use
- VGACC to check the focus of each beam by turning on red, green and blue
- respectively.
-
-
-
- ACTION KEY
- ------------------------ ---------------------
- Low intensity grid colors... Lower case b,g,c etc.
- High intensity grid colors.. Upper case B,G,C etc.
- Move text................... Arrow keys
- Move color bar.............. Shift-arrow keys
- Flip color bar.............. F
- Switch to text screen....... T
- Coarser grid................ - (minus)
- Finer grid.................. + (plus)
- Reset colors and grid....... *
- End......................... Esc
-
-
- Finally: The quality of monitors vary wildly from unit to unit.
- Insist on trying several monitors of the same type and choose only
- the best. There are a LOT of garbage monitors out there, even among
- the megabuck models. Few importers/dealers bother to realign their
- monitors after shipping. Don't let them get away with it!
-
-
- Informatic Software
- Tom Sivesind
- Svenskerud 15
- 3408 Tranby
- Norway
- Tel: +473-852200
- Fax: +473-852828
-
-