The Hue, Saturation, and Brightness (HSB) color model is not a color mode that can be assigned to
an image in Photoshop, but it is a useful way of organizing color components. The HSB model is
helpful in understanding the meaning of the terms Hue, Saturation, and Brightness. In the HSB
model, the hue is specified as an angle from 0° to 360° that corresponds to a location on the color
wheel. Saturation is expressed from 0 percent (no hue) to 100 percent (maximum amount of hue).
Brightness is expressed from 0 percent (as dark as possible) to 100 percent (as light as possible).
Colors and their degrees are shown in the color wheel: R for Red, Y
for Yellow, G for Green, C for Cyan, B for Blue, and M for Magenta.
Cyan corresponds to 180 degrees, Yellow-Green corresponds to 90
degrees, and Red can be expressed as either 0 degrees or 360
degrees.
The Color Picker is a common tool used to define colors in Photoshop
and is shown in the following figure. You can access it by clicking
the foreground color box in the Toolbox. In the HSB section of the
Color Picker shown, H is set to 180 degrees, which specifies the
color Cyan, as shown on the color wheel; S is set to 100 percent,
which specifies the maximum amount of hue; and B is set to 100
percent, which specifies the maximum amount of brightness. These
values result in a picked color that is a vivid pure version of Cyan. The picked color is shown
selected in the top-right corner of the color field box (the large square box on the left side of the
Color Picker dialog box).
(Sourse. photoshop bible)
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