Counting pixels of a specific colour

Hello.
Can anyone tell me if it's possible to load an image into
flash and count the pixels of a specific colour in that image?
I'm trying to develop an application that loads images with a
white background, then counts all the white pixels and returns the
number of non-white pixels.
I don't need a step-by-step explanation of how to achieve
this (although I'd be immensely grateful if anyone would go to that
trouble), for a now a simple yes or no, and perhaps a few clues
would be plenty of help.
Thanks in advance.

Extract the bitmapData from the image you load in - this will
be in Bitmap(loader.content).bitmapData. Then you can loop through
the bitmapData pixels with BitmapData.getPixel() and keep a tally
of white/non-white pixels.

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Solved!
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