The problem though is not really making the DI image match the print - that's rather easy to do with 3D colour cube LUTs. The real problem is getting any consistency from the film lab when processing and printing the image.

Look at the following two images to see what I mean. Click each image for a larger version.

As can be seen, all three film strips are different in either colour, density, or both.

And they were all printed to AIM and are all within the film labs working tolerance.

That makes them all accurate prints!

This shows that strive as you might to make a DI operation 100% accurate to any given film print, the moment you have the negative printed again the two prints wont match each other accurately. A film lab works to a Kodak specified tolerance of +/- 1 printer point per chemical process, which is a density change of 0.07 per process. That's a visible difference!

All three images above are within one printer point of AIM, making them more accurate than a normal release print has to be to be acceptable.