Restricting Adjustment to ROI

Posted by AlienEarthPitt on Apr 14, 2014; 12:04am
URL: http://imagej.273.s1.nabble.com/Restricting-Adjustment-to-ROI-tp5007290.html

Hello All,

I realize that this topic has been discussed, but I thought it appropriate to post nonetheless as the currently existing threads were unable to resolve my issue.

I am dealing with some CT data of a cylindrical object and have noticed that separately thresholding the outside and inside of a cylinder in the middle of the stack allows fine adjustment of noise levels in the outside.  At the beginning of the day, all I had to do was make a circular ROI on the top of the stack and then apply Brightness/Contrast or Threshold to manipulate the pixels.  This worked several times, and then mysteriously stopped functioning.  I have tried updating, restarting, reloading, etc., yet the problem persists.  Can anyone walk me through their process for this?  There must be something I am doing differently that I am not aware of...

Thanks!!

Let me know if you need any more details about the problem.