[Gimp-user] Thickening/darkening lines of scanned images


I’m a newbie to Gimp. Please could you help! 

I’ve collated self portraits from a class of 30 pupils to create
artwork for a printed tea towel. Each self portrait is very different,
varying from, pencil, felt tip pens, crayons to biro. Some black and
white, most are in colour. Every picture has been scanned in ready to
create the artwork.

My problem is, how can I thicken and darken very thin/faint lines of
scanned images? And is there a quick way of doing this?
I really don’t want to be using a paint brush/or pencil tool going
round each image, as this will take me a very long time!


As with everything graphics, all depends on the image(s).  Assuming Gimp 2.10
and Windows

First thing to try is Filters -> Generic -> Erode which grows dark areas. Try
applying a couple of times. See: comparison screenshot.

If they are reasonably clean scans  then you should get a result. Otherwise:

For something more sophisticated but still easy to use, try the Gimp gmic
plug-in www.gmic.eu  There is a Windows installer for Gimp 2.10. This has
hundreds of filters for various effects but there is one - repair scanned
documents. See: screenshot.  Adjust sliders to suit.

* https://www.gimpusers.com/system/attachments/1207/original/01-darken.jpg
* https://www.gimpusers.com/system/attachments/1208/original/02-darken.jpg

rich404 (via www.gimpusers.com/forums)

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