Apple AppleVision monitors (OS 7.1) - Manual (Page 35)

Deleting a gamma curve setting
To modify a custom setting, follow these steps:
1 Open the Monitors & Sound panel, then click the Color button.
2 Open the Gamma Curve pop-up menu and choose the setting you want to delete.
3 Open the Gamma Curve pop-up menu again and choose Delete. (The Delete menu item
will include the name of the setting you are removing.)
The setting is immediately deleted. You cannot recover a setting you’ve
deleted.
About ambient light
All light falling on the front of your monitor is called ambient light and can
change how colors appear.
For example, in fluorescent light, the colors on your monitor may look redder
than normal for the white point you’ve defined. Near a window, the colors
may look more yellow.
To get a truer color rendering, set the white point for your monitor, then
correct for ambient light conditions in the room.
IMPORTANT To correct for ambient light, the color depth on your monitor must
be set to Millions of Colors. The number of colors you can set for your
monitor depends on the screen resolution and the amount of video RAM
(VRAM) installed in your computer. If you can’t set color depth to Millions
of Colors, changing to a lower screen resolution might allow your computer to
display more colors.
35 Color Settings