Apple AppleVision monitors (OS 7.1) - Manual (Page 47)

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This chapter describes how to control the size and shape, or geometry, of the
image on your monitor. Normally, these settings don’t need to be adjusted.
However, environmental factors of your work area, such as magnetic or
electrical interference, might affect your monitor. You can compensate for
these factors using the geometry controls in the Monitors & Sound control
panel. You can adjust the following settings:
m Height/width: When the height and width are set properly, you should be
able to see the entire image on the screen with no distortion at the edges.
m Position: When the position is properly adjusted, the image is centered on
your screen. The black borders surrounding the image are the same width
on all sides.
m Pincushion: When the pincushion is properly adjusted, the left and right
sides of the image are straight and the image is rectangular.
m Rotate: When the rotation is properly adjusted, all four sides of the image
are parallel to the edges of the screen and the image is rectangular.
m Keystone: When keystone is properly adjusted, the top and bottom edges of
the image are the same length.
m Parallelogram: When parallelogram is properly adjusted, the sides of the
image are perpendicular to the top and bottom of the image.
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Geometry Settings