threshold on an area of a picture

Posted by Lena-Christin Conradi on Nov 22, 2015; 12:42pm
URL: http://imagej.273.s1.nabble.com/threshold-on-an-area-of-a-picture-tp5015001.html

Hello!

For the following question I would greatly appreciate any help or suggestion:

I need to measure the threshold of a staining in a certain area of some pictures and NOT from the whole picture. Is there anybody who would know how this can be done?

Many thanks in advance,
Lena
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