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The RGB sheet is where you select the color-space profile used
for the calibrated RGB color model. The profile used can be
selected from the Color space menu.
Reference: Preferences
The RGB Sheet
Each of the profiles listed may be classified according to its gamma
value and gamut. Gamma is a fundamental characteristic of im-
aging systems which determines the intensity of the output sig-
nal relative to the input; in human terms, gamma controls the
subjective brightness of images through alterations to the out-
put level for mid-tones. Windows and Macintosh systems pro-
cess video signals differently, and these differences are reflected
in the difference in the standard gamma values for these plat-
forms. The default system gamma for Macintosh computers is
1.8, the de facto standard for Windows systems, 2.2. Nikon CMS
includes eight RGB profiles with a Windows gamma of 2.2 (sRGB,
Bruce RGB, NTSC [1953], Adobe RGB [1988], CIE RGB, Wide
Gamut RGB, compensated Wide Gamut RGB, and Scanner RGB),
and three profiles with a gamma value of 1.8 (Apple RGB,
ColorMatch RGB, and compensated Apple RGB), for use on the
Macintosh. When scanning images, choose a profile with a gamma
value suited to the system on which the image will be edited.
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