After I scan an image into Gimp, I select Color->Levels from the menu. I use the black eye-dropper and select a dark line. Then I use the white eye-dropper and select any white space. This sets my white and black points. If the brightness is off, I can shift the grey point in the middle of the histogram.
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Thank you for including the tips! I seldom use Gimp, but I had it on my other laptop mainly for work so it's very useful to know~