Imaging Software to measure the sureface are of an image

From: "WAYNEL" <home@xxxxxxxxxxxxx>
Date: 10 Aug 2005 06:42:08 -0700

Is there a software package (pref. a free one) that can automatically
(based on grey levels) measure the total surface area of a tree in one
of my digital pictures? The picture have a 1m ruler so that I can
calibrate the image.

WayneL

.

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