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From: ImageAnalyst <imageanalyst@mailinator.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: How to extract yellow color under different iluminations
Date: Mon, 19 Oct 2009 06:47:09 -0700 (PDT)
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LIke John said, not so easy, and there is no general answer.  I
suggest you follow his advice and give a description of what you
want.  Part of that would be posting several images somewhere (on a
free image hosting website such as flickr.com).  It's easier to give
advice on color segmentation when you have the images to look at.
P.S. Perhaps you'd like to play around with the really nice 3D gamut
visualization plugin for ImageJ here:
http://rsb.info.nih.gov/ij/plugins/color-inspector.html
Maybe you'll see your yellow cluster well isolated.

Perhaps you'd like to review one MATLAB implementation for color
segmentation.  Maybe it will work for you - maybe not.
http://www.mathworks.com/products/demos/image/color_seg_k/ipexhistology.html