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Question about flats
There are a number of ways of taking flats, but as far as I can see, they all offer the opportunity for the flat not the be a uniform grey. Twilight flats for eample might show a slight red cast and DIY lightboxes could have any sort of colour cast, depending on the light source used.
Two questions:
Is this a problem?
If it is, does it help to convert all flats to grey level before calibration?
Geoff
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