Photoshop Adjustment Levels help?

yellowray33

New member
I have a few drawings that I had scanned, saved in RGB mode. Now I can't figure out how keep the Levels adjusted. I go to Levels and play around with it, and it shows a preview, but whenever I press Okay, nothing happens. I've tried afew of my other drawings, same thing. Shows preview, but does nothing.
How do I fix it? What am I doing wrong?
I need to eventually print off those drawings.
 
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