MONITOR PART OF MY SCREEN & EMAIL ME ON COLOR CHANGE

I would like someone to write me a program that: 1. lets me select a square or rectangular part of my computer screen 2. sends me an email when there is a change in color, I can specify the color, if there is any change in the area (amount) of that color that color on that selected part of the screen 3. Need to be able to run multiple instances of this program for multiple parts of the screen I need the source code too. That's all. Key words: screen capture