Calibrated color space with red, green, blue, and alpha components.
You can also create a color with HSB (hue, saturation, brightness) and alpha components and can extract these components.
Available in Mac OS X v10.0 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)