> No one responded then. I had hoped someone would have chimed in. So I 
thought I'd try again.

Hi,

This is grasping at straws a bit, but you might be able to use something 
like adaptive threshold edge detection [1] in gimp to identify continuous 
lines in the image, and then extract them. It would take some gimp 
wizardry but the lines seem clean in the sample images.

art
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1. https://github.com/parnham/plugins

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