This step is very easy. Open your scans(s) in Photoshop, and find Levels.
Command: Image -> Adjustments -> Levels (or Ctrl + L)
And you'll see something like this...
Now, see the gray arrow? If your scan is too dark, slide the gray arrow toward the white arrow. If your image is too bright, slide the gray arrow toward the black arrow.
And that's it!
Pretty easy, hey?
Next up... remove dust and scratches.Click Here For The Full Tutorial On How To Fix Grain, Dust And Scratches In Photoshop
Which of these scanning troubles do you want to overcome?
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The reason I'm telling you this is because no matter what challenge or frustration you're having, I know exactly what you're going through. So, to help you RIGHT NOW, I've put together a super simple scanning guide to get you started.