How to un-grey-out "Image - Auto contrast"?

I just opened my first jpg in Photoshop CS5 and tried to use "Image -> Auto contrast" but all of the Auto's (Tone, Contrast, Color) are greyed out. The Image -> Mode is set to "RGB Color". There is only one layer and I tried various combinations of selecting (Command A) and de-selecting (Command D) the image but the Auto's stay grey.
The latest Photoshop CS5 Extended (Version 12.0.2) is running on a Mac Book (Snow Leopard 10.6.6).
I'm reading Peter Bauer's "Photoshop CS5 for Dummies" and Scott Kelby's "Photoshop CS5 Book" but can't find the answer in either. I also searched the forum for "auto contrast greyed out" but got 0 hits.
Any help would be greatly appreciated.

The whole issue of working non-destructively may be of little importance if you are starting out in Photoshop and are acquainting yourself with the various tools and features, but later on it can become a significant time-saver.
The Photoshop Help offers something on the issue, too (see »Nondestructive editing«).
Basically the target is maintaing pixels content intact and any corrections (both of form and color) editable.
The techniques employed to achieve this include:
• Performing Touch-up (Clone Stamping and Spot Healing) on separate Layers
• using Layer Masks instead of deleting and erasing
• using Adjustment Layers instead of applying an Adjustment directly whenever possible
• performing Transformations, Puppet Warps and Filter applications on Smart Objects
etc.
Anyway, I may have been hasty previously; the Help states (p.136, following similar points for Auto Contrast):
Remove a color cast using Auto Color
Auto Color adjusts the contrast and color of an image by searching the image to identify shadows, midtones, and highlights. By default, Auto Color neutralizes the midtones using a target color of RGB 128 gray and clips the shadows and highlight pixels by 0.5%. You can change these defaults in the Auto Color Correction Options dialog box.
1Do one of the following:
•Click the Levels or Curves icon in the Adjustments panel.
•Choose Layer > New Adjustment Layer and choose either Levels or Curves. Click OK in the New Layer dialog box.
Note: You can also choose Image > Auto Color to apply the adjustment directly to the image layer. Keep in mind that this method discards image information and is automatic. You cannot adjust any of the options in the following steps.
2In the Adjustments panel, Alt-click (Windows) or Option-click (Mac OS) the Auto button.
3Under Algorithms in the Auto Color Correction Options dialog box, select the Find Dark & Light colors option.
4Select the Snap Neutral Midtones option.
5Specify the shadows and highlights that are clipped, and adjust the target color for the midtones.
6Click OK to apply Auto Color.
So the result should be achievable with a Levels or Curves Layer straight out.

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