Apple Macintosh Performa 577 - Manual (Page 137)

Adjustments Video - 16
3 Select the Screen Control
Panel in the Control
Panels folder. Drag the
brightness control to
midrange.
4 Note the predominant
color.
5 Using a hex-head plastic
adjustment tool,
alternately adjust the
red (RB), green (GB),
and blue (BB)
background controls
until there is no
predominant color in
the four darkest bars.
Gray Bars