Anyone know if there are any film scanners in the works that might encode to DNG. I can't say as there would be an inherent advantage to DNG over other DI formats, although raw manipulations of the file could be a lot more efficient than re-encoding DPX's for instance. But really what I'm interested in is that if I have a CinemaDNG workflow and decide to use film, I don't have to change a thing once I scan the film.
Don't know of any film scanners with DNG support yet.
Is there a vendor you think we should approach?
A film scan could be stored in DNG. Preferably you would use 10-bit
log encoding of RGB, just as in DPX. You also would need to store the
proper parameters: an anti-log decoding table, a matrix to XYZ.
Note though, that the DNG color management is designed for digital
capture, not film. The interimage effect of film is not handled in
the simplest DNG color management use case, so it won't restore the
correct scene colorimetry (which is what you want for VFX). Of
course, you may be fine working in linear RGB regardless of color
we are a small company which develop a 2k filmscanner for 16mm and 35mm film. after i heard from iridas that they support DNG in speedgrade i thought this could be a nice feature to store directly dng with our scanner. we are using a 1 chip ccd 2k camera and so we could easy implement dng. can you give us more details to make a decission if it is really a good idea to work with dng as DI?
with kind regards
Lars, I'm certainly not an engineer so I'm not sure what takes place in the raw file. I obviously can't scan more detail than is present in the image being scanned; however when I shoot a still with my DSLR and store it as raw, I can then take it into the digital dark room and pull more detail than is immediately visible. I can pull the exposure slider down a stop or two and highlights which seemed blown out now have detail. In film terms, I'm "printing down." The same thing takes place in the raw files coming off a Red camera - a user can alter the exposure by changing the ISO in post. This is the kind of thing I'd like to be able to do with a film scan. Perhaps it requires more than a 10-bit log file to do so. Maybe it needs to be 16-bit linear to capture more detail than is immediately visible in order for an operator to bring that detail into visible space. After all I assume that you would want linear data to which you would apply a logarithmic LUT for post processing and eventual output to DPX or whatever.
Again, I'm not an engineer, so some of what I'm thinking may be incorrect; but my ultimate goal would be a fully raw workflow even if I had film origination.
Yes, you can store a film scan in DNG format. Note that the raw film
scan is always log encoded, as the film has a log response to light,
so the DNG file will be log encoded as well. The film's response
usually helps you preserve detail in the highlights.
A typical DPX file stores 10 bits per channel, while DNG often stores
more, depending on your camera sensor. Don't know if those extra bits
help much, though.
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