Profile Unwrap
The Profile Unwrap tool takes whatever is in its user defined ROI and lays it out in a straight line.

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Setup the ROI |
The Unwrapped Image |
Using the Profile Unwrap Tool
Position
the Profile Unwrap ROI onto the image viewer. Right-click the tool and
choose "Train". When the tool is run it will turn the unwrap
whatever is in the ROI into a straight line.