Total pixel count for specific shades

I am photographing fixed points along an artificial stream bed and want to document algae growth in it over time.  There may be up to 7 different shades of green (types of algae) in a given photograph.
Can Photoshop CS4 separate these shades and give you a total pixel count of each shade? 
I was told by techical support that if you select an area with a tool that the histogram can give you a pixel count (along with the RBG values) for that given area.  Is there a way to click on a particular shade point and have PS computate the total pixel count of that shade in the entire photograph.
The magic wand tool does not appear to be a reliable tool for this purpose.

Hi Paulo:
Thanks for your response!  When I go to Select/Color Range and set the bar to low fuzziness, I get an eye dropper.  When I click the eye dropper on the photograph, nothing happens in the histogram to indicate a pixel count.  I am missing a step?
Thanks, Bretzfrog

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    Thank you very much for your response!
    Your directions work very well for a single image.  I have an entire series of images and was wondering if I could just enter a specific set RGB values some where and see a total pixel count for each one of them.
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