Apple IMAC User Manual - Page 291
Adjust the Sub Contrast, Contrast, or Sub
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Adjustments Cutoff - 24 5. Adjust the Sub Contrast slider to increase the screen brightness until the luminance measures correctly. Important: The Display Adjustment Utility requires that your system be restarted in order for Color, Sub Contrast, or Sub Brightness changes to take effect. 6. Click the Save button in the Color window to save your settings.
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Adjustments
Cutoff - 24
5.
Adjust the Sub Contrast
slider to increase the
screen brightness until
the luminance measures
correctly.
Important:
The Display
Adjustment Utility
requires that your
system be restarted in
order for Color, Sub
Contrast, or Sub
Brightness changes to
take effect.
6.
Click the Save button in
the Color window to save
your settings.