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CinemaDNG DI?

Nov 20, 2009 11:13 AM

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.

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    Nov 20, 2009 11:48 AM   in reply to cmdurham

    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




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    Nov 27, 2009 11:14 PM   in reply to Lars Borg

    hi lars,


    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


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    Dec 1, 2009 11:11 AM   in reply to cmdurham



    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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