Question to getColorBoundsRect

Good day to you.

I´m working with BitmapData.getColorBoundsRect and it works so far fine for me. But what if I want to find more rectangles with the same color? For example: I got a BitmapData with 3 red rectangles. If I use getColorBoundsRect I get the whole area including the 3 rectangles. Is there a way to seperate each rectangle?

Thx!
TZP