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Pixel count via RGB range

Posted by Gus on Sep 08, 2010; 9:46pm
URL: http://imagej.273.s1.nabble.com/Pixel-count-via-RGB-range-tp3686979.html

Hello,

I'd like to use this software for digital vegetation profiles. The idea is
to place a 0.5m x 0.5m white background (drop cloth, poster board,etc.) in a
field plot and take a picture of it from a certain distance. I'd then crop
out just the half meter square area to analyze.

I suspect that the leaves and twigs would have a fairly small RGB range, as
compared to the white background, that I could specify and then have ImageJ
count the pixels in that range. All that's left is to divide by that number
by the total pixels to get a percent cover of vegetation.

If someone could point me in the right direction on how to do this with
ImageJ I would be very grateful.

Thanks!