Quote Originally Posted by MDR View Post
I'd say you get more latitude and dynamic range with neg film so neg to neg should be better. Positive films usually have more inherent contrast than negative films meaning they retain less image information that can be reproduced and you already loose a lot of information at the copy/printing stage. Neg low contrast to ultra low contrast Neg (print) pos higher contrast to slightly higher contrast (loss of information).
Some MUCH Older colour processes did actually use reversal film. About the third or forth version of Technicolour was a single strip camera system. Technicolour had a deal where Kodak provided them Kodachrome stock. they processed it and made B&W separation Negatives, which then were compatible with the rest of the technicolour process from the three strip Technicolour cameras.

The first system that was used for making 16mm colour movies used Kodachrome camera film, and A special Kodachrome Print stock - both reversal. When ektachrome came out, their was a Special Low contrast 16mm stock called "Ektachrome Commercial" which could be printed on a Kodachrome release print stock.

The driver was the reversal stocks had smaller grain. Once Eastman Colour Negative got past it's first few versions, the grain was down enough that ECN started to be made available in 16mm Big budget 16mm films could also shoot 35mm and make reduction prints on 16mm stock.

The Movie Negative films are of lower contrast than the Still colour films. I played with them about 20 years ago. There were some labs who took advantage of the fact that the movie industry often generates "short ends" (part rolls of Movie film of less than 400 ft) and sold them for still use, including making a print on EASTMAN colour print film. Trying to print the negative on regualr colour paper showed the lower contrast, and sure enough the same labs would offer to process regualr C-41 film, and then make slides on ECP. HIGH contrast slides!

today, scanning is much more the norm, followed by editing as d*g*t*l video and using a Laser film recorder to make a new negative to produce the needed ECP film prints. Here again the latitude of the negative film rules the day, as well as the experienced workers being much more confortable with the materials they are used to using.