>>3582909Simple detectable way are film simulations. You have 3dluts and even simpler film simulating programs from dxo labs, nik collections and other vendors. Easy to use, but still needs properly exposed digital images.
Undetectable is complex film emulation. 3dluts on a very clean colour neutral image, then you correctly add film noise. You need to be careful with that. Slide film noise is about the same as digital. Higher noise in shadows, negative is reverse of it. Higher noise in highlights. You then need to fix regular tells, like gradients on skies and blown highlights. Also, by undetectable I mean online images, it'll only slide as long as someone doesn't asks for your negatives.
