09-20-2018, 06:19 PM
I think the real solution will be use some other application for stitching the images together. Nip2 is the tool for large mosaics but difficult to use, or you might get Hugin to work.
Using Gimp you might get a fix using the g'mic plugin http://www.gmic.eu One of the filters in the repair section local similarity mask
A screenshot using your small jpeg https://i.imgur.com/myDqvbf.jpg You will have to play with the settings, it will produce a new layer. Put that layer in multiply mode. https://i.imgur.com/ZBPseu3.jpg
Might/might-not work, I do not really know what it should look like
Using Gimp you might get a fix using the g'mic plugin http://www.gmic.eu One of the filters in the repair section local similarity mask
A screenshot using your small jpeg https://i.imgur.com/myDqvbf.jpg You will have to play with the settings, it will produce a new layer. Put that layer in multiply mode. https://i.imgur.com/ZBPseu3.jpg
Might/might-not work, I do not really know what it should look like