[Gimp-user] Enhancing old document

I am trying to use GIMP (2.8.10) to make some indistinct annotations
on a medieval manuscript more legible.  Typical of the published
images of its pages is

Examples of the scrawled additions I am trying to enhance are those in
brownish ink after the end of the main (blackletter) text, and across
the foot of the page.

So far I have tried Unsharp Mask (including varying the parameter
settings); several of the colour adjustment tools (including the
interesting but drastic Auto > Equalise); and Rob A's high-pass
filter.  All of these are some help, but I'm still looking for
something better - and as a relatively inexperienced Gimp user, I'm
concerned that I don't have a good enough understanding of the problem
to pick the right tools.

Can anyone help, please?  I would be really grateful for any and all

Thanks, Alan

PS Ideally we could do with higher-resolution images to begin with,
but as I don't have access to the original manuscript I have to work
with those available on the web.

I do not think there are any "right tools" for this. Experimenting as you have
done, is a good way to learn about Gimp.

If the same as I downloaded (about 400 x 600 pix) then really..a bit too small.

You could try:

1. Select the areas required. I used quick mask but freeselect in add mode works
as well. see screenshot 1

2. With the selection active (toggle quickmask off) use the gmic plugin
www.gmic.eu and the repair scanned documents filter. Output typical settings and
output mode shown screenshot 2

3. Gives this with when selection is turned off screenshot 3

4. Put the new layer into Multiply mode to merge, gives as screenshot 4 but back
to small image size and pixel sized graphics.

Using Gimp 2.8.10? Why, when the most recent stable is Gimp 2.8.22

rich: gimp-forum.net

* http://www.gimpusers.com/system/attachments/841/original/01doc.jpg
* http://www.gimpusers.com/system/attachments/842/original/02doc.jpg
* http://www.gimpusers.com/system/attachments/843/original/03doc.jpg
* http://www.gimpusers.com/system/attachments/844/original/04doc.jpg

rich404 (via www.gimpusers.com/forums)

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