Cutting a black part around grey paper

Posted by Richard Kadot on Sep 16, 2016; 9:00am
URL: http://imagej.273.s1.nabble.com/Cutting-a-black-part-around-grey-paper-tp5017192.html

Hello,
I am new on this site.
I need to process 4000 pictures.
They are old written letters between 1910 and 1950. Small and large, many sizes.
I scan in grey level with a black paper background.
Is it possible to create or find a macro to "cut around" the black background ?

Where do I search ?

Regards,
Richard K.

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