> bart, by the way, if I do that, can you recommend any software that is already
> set up to easily combine all the channels, since I would have a huge collection
> of images?  I may also want to weight the brightness by the human spectral eye
> response curve.
> 

Check XnView/NConvert (www.xnview.com).It's free, available for many 
platforms
and can read raw RGB images. It also has a GFL SDK library for developers.

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