Part of Magic Wand Roi to Segmented Line

Posted by ard on Jun 08, 2017; 2:04pm
URL: http://imagej.273.s1.nabble.com/Part-of-Magic-Wand-Roi-to-Segmented-Line-tp5018868.html

We have the Magic Wand tool pick up the very irregular edge of an object quite well.
Unfortunately the ROI then also includes the loopback to the start of the ROI, often but not always coinciding with the edges of the image.
Is there a way to indicate 2 points on the ROI the Magic Wand picked, break the loop and discard the portion that follows the image's edge?
The objective is to measure the remaining path length of the segmented line thus created.
Removing part of the ROI by using other tools in combination with the modifier keys still keep the 'flyback' part of the path in the loop.
Thanks!
Ard
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