better line length measurement...

Posted by Nick-2 on Mar 23, 2011; 6:01pm
URL: http://imagej.273.s1.nabble.com/better-line-length-measurement-tp3685292.html

Hello.

I am trying to use imagej to measure line widths.  I am quite
comfortable setting the scale and using the line tool to make a
measurement, but I was wondering if there was some way to help guide
the line I draw and make sure that it is perpendicular to the feature.
 For instance, other programs usually have a tool that looks like:
|<------->|
I am really after those vertical lines on the edges (perhaps a bit
longer).  So, if I am measuring the width of a strip, I can align
those vertical lines with the edges of my strip; helping me get more
accurate measurements.

I know that by holding down the shift key I can make the line I draw
perfectly horizontal, but my images may not always be in the proper
orientation.

I also thought that I could use the rectangle tool to make a box and
measure the width and height, though I cannot rotate it...

Any ideas?