I’d also request for the colours to be left on this just as the projected print shows. 35mm prints were more yellow and green than red. We saw this on the 35mm and 8mm examples of Terminator 2, as well as Jurassic Park.
Digital grading cannot successfully emulate the look of photochemical timing, which is why neither Jurassic Park 3D or Terminator 2 3D (I saw it twice theatrically) could emulate the photochemical colour dynamism. There was very little colour separation in both JP3D and T23D because of the limitation of digital colour space.
Because there is already so much good colour information and colour separation on this Titanic 35mm, it’s best to match it to projected colours (you’ll need to use the very same bulbs they used in the cinemas back then) and leave it at that. If there’s no way to accurately find out 1997 projection bulb colour temperature, then it’s best to leave the colours on the print alone. This is my suggestion anyway.
Also, @RU.08, I sent you a PM. Please check and let me know. Thanks.
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