calculate the number of pixels using a histogram specifically for 3 colors

From: coold (nrodricks_at_gmail.com)
Date: 02/18/05 

Date: 18 Feb 2005 11:38:00 -0800

Hi,
I am trying to calculate the number of pixels using a histogram
specifically for 3 colors(white,black and green) in a image (256
colors). I have modified the color palette for the image so that the
background is white and the dark colors are black and the light green
remains the same.
I am unable to interpret the results as indicated by the histogram. I
have uploaded the pictures.
http://pg.photos.yahoo.com/ph/coold_2006/album?.dir=/b4b9&.src=ph

Would appreciate any help in how to calculate the number of pixels of
white, black and green.
Thanks.
coold

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