11-03-2019, 03:48 PM
For that particular type of scan the method proposed by Ofnuts works very well.
Duplicate the layer
Put the duplicated layer mode to divide
Blur the duplicated layer, 'Filters -> Blur -> Gaussian Blur'
Adjust the x/y values and being a GEGL filter you can see the result as you adjust.
Otherwise, the gmic plugin http://www.gmic.eu has a very good 'repair scanned documents filter.
Duplicate the layer
Put the duplicated layer mode to divide
Blur the duplicated layer, 'Filters -> Blur -> Gaussian Blur'
Adjust the x/y values and being a GEGL filter you can see the result as you adjust.
Otherwise, the gmic plugin http://www.gmic.eu has a very good 'repair scanned documents filter.