Greyscale image, can't adjust contrast/levels.

A very recent problem - I have some greyscale scanned images - nothing fancy, batch-scanned via document feeder at 600 dpi - and my problem is this: I try to adjust contrast or levels, I see the effect I want in the image as I do so, but when I dismiss the contrast/levels dialogue, the change doesn't 'stick'.
I can delete parts of an image, paint-bucket for example works fine, I can save. I expect it's something obvious :(
OS X 10.3.9, Photoshop CS2. Memory is 1.25Gb (yes, I'm a lightweight ;) )

No. What I'm saying is they are
i like
bitmap mode, in that scanned grayscale images of line or halftone pics tend to have very little gray information. It's made mostly of black or white pixels. So Level or Curves adjustments have little effect. In addition, you will get a FALSE preview on any Level/Curves adjustments on these types of images when viewed at less than 100%. Just as you describe.
Same thing would happen if you took a detailed 1-bit file and converted to grayscale. The Levels/Curves adjustments would be available. A preview at less than 100% might show that Levels are lightening or darkening. But when you commit the command, the adjustment seems to disappear! That is because you only have 0 or 255 pixels, you can't lighten white and you can't darken black and there are no pixels in-between to affect.

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