Calibrating an Intel iMac display using Spyder2PRO

Recently switched from Windoze to a 20" Intel iMac.
With previous monitors, I used the buttons on the monitor to calibrate.
The Spyder software asks what adjustments are available on the iMac, and since it is all in software I can't be sure. Backlight? Brightness? Color sliders? What is there is not apparent in the Mac calibration routine...
Anybody know?
Thanks,
Arthur
iMac 20   Mac OS X (10.4.8)  

The software for the Spyder2PRO asks what adjustments
are available on the iMac monitor, and I can't find
them listed. Specifically, it asks if there are
adjustments for:
Gamma
White Point
Brightness
Contrast
Backlight
RGB Sliders
Kelvin Slider
Kelvin Presets.
Apparently, there are no RGB sliders, as the software
says they need adjusting but I see no way to adjust
them.
Thanks,
Arthur
iMac 20   Mac OS
X (10.4.8)  
iMac 20   Mac OS X (10.4.8)
Check Backlight, its the only adjustment. Even though you might think its the brightness adjustment on LCD the brightness is conctrolled by the backlight. That's what Color Vision told me to do.

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