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Ahh! Leon there is a can of worms if ever there was one.
Colour!!
When a raw Flat frame is subtracted from a Raw Light Frame, the colour balance of the resultant calibrated light frame will be influenced by the colour (off whiteness) of the Flat frame. That is true as far as it goes. I have been given to understand that with Images Plus (Remember I don't have that!) converts flat frames to grey scale thereby eliminating colour bias from the flat field light source. If all this is true (Which it is not with MaxDslr), then you should never be deal;ing with anything other than a Raw Flat frame ie. before debayering.
HTH,
Doug
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