Procedural Fractal Wipe HELP

RobNSteveFilms
RobNSteveFilms Posts: 45
edited March 2013 in Post-production techniques
I'm trying to use the Procedural Fractal Wipe effect that Simon K. Jones did a tutorial on. With this effect I intend to change the color of a backpack from BLUE to RED. As you can see, the original color of the backpack is RED. I will be keyframing a mask around the backpack and color it blue, then use the Fractal Wipe effect to reveal the RED. Is there a way to make the area in White transparent to reveal the original color? 

 [attachment=529:Backpack.png]

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