Can AS find pixels by color?

In another scripting language I have used for other purposes (AutoIt Script) there was a function called pixelSearch where you could find pixel locations based on a color.

What I would like to do is develop a SWF that “reads” the colors of an image and applies a sparkle effect to the areas that are deemed bright enough (close enough to #ffffff). Ultimately, it would be really cool if I could make it figure out how large the bright area was to make a larger sparkle effect (increase size of sparkle MC) or that if it was too bright, it would assume it was background and not use the effect in that location.

This effect would be used to load various thumbnails from a database and render them in the browser, each with the same SWF but different image parameters, to make the images sparkle appropriately.

Any ideas on this one?

Thanks,
99ways