Calculating grazing area

Posted by joshcurran on Jul 10, 2017; 1:53pm
URL: http://imagej.273.s1.nabble.com/Calculating-grazing-area-tp5019047.html

Hi there,

I'm brand new to ImageJ and am just trying to get to grips with it. I've been playing around with it all day.

I'd like to calculate the percentage area grazed by snails across an algal biofilm. I understand that I can threshold the image, but the biofilm isn't amazingly consistent with colour across the dish. When I was practicing and testing it out earlier on when thresholding it wasn't really covering the parts I wanted it to. Any advice or tips? Or is there another way that grazing area could be measure?

Many thanks,
Josh