How to clean a scan of handwriting?

[Gerenuk]

(01-13-2018, 10:56 PM)Ofnuts Wrote: 2) See https://docs.gimp.org/en/gimp-tool-levels.html But I wonder how you got colors? Screenshot?

3) Little known: View>Display filters and add Contrast or Gamma to the panel on the right. This changes the way the image is displayed, but not the image itself. Click on the filter you added to display its settings.

Oh, you get colors (yellow) when you add the layer mask to the wrong layer (the background), then open the levels tools on the correct layer and click "Channels Auto". My fault.