Apple ColorSync Display - Manual (Page 49)

Adjusting convergence
Red, green, and blue signals in your monitor converge to create the colors you
see on your screen. If the convergence is not set properly, images or text on
your screen may appear blurred, or you may get a “rainbow” effect with
several colors forming the edges of images on the screen.
If your monitor is exposed to an external electromagnetic field (for example,
from another monitor) over a period of time, you may need to change the
convergence to get a clear, distinct screen image.
Use the Convergence menu to adjust screen convergence. When convergence
is set properly, the image is clear and distinct.
Vertical
Adjusts the vertical convergence. Press – to move the red signal down and the
blue signal up. Press + to move the red signal up and the blue signal down.
Horizontal
Adjusts the horizontal convergence. Press – to move the red signal to the right
and the blue signal to the left. Press + to move the red signal to the left and
the blue signal to the right.
- +
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Select to show the
Convergence menu.