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not sure how you would do it in gimp. but in photoshop, after you have your colour balance sorted you would/should blend in a mono version of the three channels (processed separately for your detail and dynamic range) so that the details are all maintained and not destroyed by processing in rgb. copying that over as a new layer and blending it in luminosity mode. the image then maintains the detail of the mono image but has the colour of the rgb (without the destructive effects). gimp should be able to do this.
cheers
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