Separating and stacking RGB images

I have a body of 3 images contained within 1 file. In descending order they are Blue > Green > Red channels, so that when combined they will produce a full RGB image. I require a method of splitting the images into 3 seperate files using an automated method. I have managed to manually select the x,y co-ordinates to succesfully remove them from each other but were this to be applied to more than 1 image it would be a time consuming process and as such require a method that will automatically find the edges (using Sobel or prewitt preferably).
Any help greatly appreciated

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2013-3-18

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