saturation, only increase?

[BabaG]

on mac pro running osx 10.4.8 i've tried to adjust the
saturation with the h l s sliders but when i open the window
all the sliders are all the way at the left so that i can only
increase the saturation.

thanks,
BabaG

Machine Name: Mac Pro
Machine Model: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2.66 GHz
Number Of Processors: 2
Total Number Of Cores: 4
L2 Cache (per processor): 4 MB
Memory: 5 GB
Bus Speed: 1.33 GHz
Boot ROM Version: MP11.005C.B04
SMC Version: 1.7f8