Taking a break from other stuff that is keeping me busy, so I though I ought to have a go at photographing a colour negative on the lightbox.
Colour correction was obviously going to be as issue as the inverted image has a blue cast. Scanner software no doubt has a play on colour channels but I tried a simple way round using White, Black and Grey/Neutral points. Mixing colour channels has always been a problem for me to the extent that in the darkroom days I sought out a Phillips enlarger as that is additive rather than the more normal subtractive method
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I first tried W/B/N points in my fav editing program Nikon NX2, and it worked nice and easy. So a quick trial in CS and the results were the same. The opacity reductions shown in the grahic are as I applied in NX2 where the effect can be easily seen in Double Threshold. I am not sure how to do that in photoshop, so perhaps someone can give a clue here. Setting 100% on white point will easily blow light colours as in the sky in this image so some opacity reduction is required. Black point is a lot easier to judge. Positioning the Neutral point is a bit of trial and error but a second point can easily be added to remove any remaining colour cast later.
In this example the further processing steps were a small local reduction of contrast ( yellow, blue and red areas ), curves, and a touch of noise reduction to smear the grain on the fuselarge.
The negative used here is 35mm ILFOCOLOUR HR100, a film dating back to the early 1980's, so it is not quite as fine grained as the more modern Kodak Gold or Ultra.
Attatched images are the process graphics and the final result.
Don