VIEWSONIC A91f+ - Manual (Page 11)

Main Menu Controls
Adjust the menu items shown below by using the up
and down buttons.
Control Explanation
Contrast adjusts the difference between the image
background (black level) and the foreground (white level).
Brightness adjusts the background black level of the screen
image.
Horizontal Size adjusts width of the screen image.
Horizontal Position moves the screen image left or right.
Vertical Size adjusts the height of the screen image.
Vertical Position moves the screen image up or down.
Zoom expands and contracts the entire screen image.
Pincushion curves the vertical sides of the screen image.
Pin Balance curves the vertical edges of the screen image to
the left or right.
Trapezoid adjusts the top and bottom of the screen image
until they have equal length.
Parallel slants the vertical edges of the screen image until
they are parallel.
Top Hook adjusts the top corners of the screen image.
Bottom Hook adjusts the bottom corners of the screen
image.
ViewSonic
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A91f+