"Gamma" slider in Preview's "Adjust Color" window now absent in 10.6. Why?

In Preview, if one chooses "Adjust Color" from the "Tools" menu, a small window pops up with various sliders allowing one to make minor adjustments to the jpeg -- contrast, sharpness, exposure, etc.
In previous versions of Preview that came with 10.4 etc., one of the sliders was called "Gamma," and I found it very useful. I'm no photographer nor a professional graphics person, so I couldn't even tell you the exact definition of what a "gamma adjustment" even is, but in my experience I found that it seemed to lighten the dark areas of the image without overly lightening the already-light areas. By fiddling with a combination of the "Contrast" slider and the "Gamma" slider, one could rescue a photo that was badly lit or unevenly exposed.
But in the new version of Preview that comes with my Snow Leopard 10.6.4, the "Gamma" slider has been removed entirely, replaced by the far-less-useful "Temperature" slider, which instead subtly adjusts the tint to appear warmer or colder (red/blue).
What happened to the "Gamma" adjuster? Is there any way to restore it, or customize the "Adjust Color" window?
What a bummer.
I really like Preview's "Adjust Color" sliders, and find them to be much more convenient for basic photo sprucing up than the more complicated controls in PhotoShop and other pro-level programs. I realize I can adjust the Gamma in these fancier programs, but I'd much rather have all the needed adjustment-controls altogether in the same program.
Any suggestions? I don't want to have to try to re-install an ancient version of Preview just for this one feature.

I did a Google search & found - http://earthlingsoft.net/ssp/blog/2009/08/macos_x6part2
"*Gamma: Apple (finally) changed the gamma value of their display calibration.* There goes the classic Mac look… well it’s not quite as (a) my MacBook’s screen is a crappy dithering **** anyway so I am in no position to notice anything and, more significant in a global sense, (b) the magic of colour management means that you shouldn’t see the difference caused by the gamma change on colour managed images. What remains are the UI elements and Apple seems to have done a reasonable job of making things look all right. Just some of my old icons seem to look a bit different now. In the long run I imagine this change may be beneficial for people who publish images on the web without knowing what they do. "

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Might try this...
Safe Boot , (holding Shift key down at bootup), use Disk Utility from there to Repair Permissions.
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"Gamma" slider in Preview's "Adjust Color" window now absent in 10.6. Why?

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