manual fix - working proof of concept

So I looked into the csv files and found the highest intensity y-coordinates using a pivot table, and the boundary coordinates for a line. And with those coordinates, my code generates these two images.
Boundary markers :

Intended whitewashed output :

This shows that the algorithm is correct, however, there is something wrong in the way the code is finding the maximum intensity line. Currently, I was using max( , key=itemgetter()) method to find the maximum intensity element within the sublist. I will try to do it in some other way.

So Long.