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Need some help please and I will be specific. Scanning C41 Negatives using my Nikon D600/D800 with a Sigma 105 1:1 macro lens to produce 6 stitched images of 4x5 C41 negative. Scanning with fluid, AN glass and a sheet of optical mylar, the set up is as follows. light source, raised AN glass (frosted side up) layer of fluid, negative emulsion side up, fluid, optical mylar. DSLR shooting through the optical mylar and using live view highly magnified, focusing on the film grain. Lens at f8. file produced as RAW. The results are stunning and we have compared the results to an Epson V750 and I have sold the Epson. The questions is this; Using Affinity Photo (Mac) how do I convert the C41 to colour without the orange cast? I guess somewhere you need to sample the border strip and convert it from orange to blue as it is the base layer but other than this I have tried a few things and gone around in circles. Black and white and E6 positives are obviously easy and no problem but this Orange Cast..... Thank you very much for anyones time who replies. kind regard Graham.