isolating lichens from the background

Posted by Charles R Parker on May 16, 2008; 2:02pm
URL: http://imagej.273.s1.nabble.com/isolating-lichens-from-the-background-tp3696183.html

I'm new to image processing and ImageJ, so please bear with me. I need to
be able to measure the area of healthy and necrotic lichens in
photographs. Examples are at http://dlia.org/images/Parker/ParkerTIFS.html

 So far, I have not been able to isolate the lichen from the background,
let alone measure anything. I would appreciate any suggestions anyone may
have on a suitable approach.

Thanks,
Chuck
=========================
Charles R. Parker, Ph.D.
Research Aquatic Biologist
U. S. Geological Survey
1316 Cherokee Orchard Road
Gatlinburg, TN 37738

E-mail: [hidden email]
Phone: [phone]