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Technical discussion of the DNG files made by Blackmagic Cinema Camera
  • I'd love to get going with a grade in Resolve but everytime I try to track or do anything else ambitious I am crashing out with a CUDA error. I got an x79 system with a GT640 card so I think I am in spec.

    Seeing as I can't play with the image I have decided to have a look at the bits. Attached is a dump from Exiftool/RawDigger and an image showing the data before demosaicing.

    ---- File ----
    File Name                       : Frame000369.dng
    Directory                       : F:/___Video/___BMC Test/Shot 3
    File Size                       : 4.8 MB
    File Modification Date/Time     : 2012:08:23 13:00:40+10:00
    File Permissions                : rw-rw-rw-
    File Type                       : DNG
    MIME Type                       : image/x-adobe-dng
    Exif Byte Order                 : Big-endian (Motorola, MM)
    ---- EXIF ----
    Subfile Type                    : Full-resolution Image
    Image Width                     : 2432
    Image Height                    : 1366
    Bits Per Sample                 : 12
    Compression                     : Uncompressed
    Photometric Interpretation      : Color Filter Array
    Strip Offsets                   : 9856
    Orientation                     : Horizontal (normal)
    Samples Per Pixel               : 1
    Rows Per Strip                  : 1366
    Strip Byte Counts               : 4983168
    Planar Configuration            : Chunky
    CFA Repeat Pattern Dim          : 2 2
    CFA Pattern 2                   : 1 0 2 1
    TIFF-EP Standard ID             : 0 0 0 1
    DNG Version                     : 1.2.0.0
    Unique Camera Model             : Blackmagic Cinema Camera
    Linearization Table             : (Binary data 20917 bytes, use -b option to extract)
    Black Level Repeat Dim          : 1 1
    Black Level                     : 256
    White Level                     : 60074
    Default Crop Origin             : 16 8
    Default Crop Size               : 2400 1350
    Color Matrix 1                  : 1.31197 -0.49679 0.01156 -0.41723 1.44237 0.04528 0.06723 0.2171 0.72651
    Color Matrix 2                  : 1.00885 -0.27351 -0.08258 -0.48997 1.34441 0.11174 -0.06406 0.32997 0.53917
    Camera Calibration 1            : 1 0 0 0 1 0 0 0 1
    Camera Calibration 2            : 1 0 0 0 1 0 0 0 1
    As Shot Neutral                 : 0.629 1 0.7904
    Baseline Exposure               : 2.4
    Calibration Illuminant 1        : Standard Light A
    Calibration Illuminant 2        : D65
    ---- Composite ----
    CFA Pattern                     : [Green,Red][Blue,Green]
    Image Size                      : 2432x1366
    
    

    I've only just started reading about RAW and the DNG format and I guess it seems obvious but RAW is not a standard anything which is why Adobe had to make DNG. Still this DNG does not look the same as the DNG I get from a RW2 converted so maybe DNG will have just as much variance as the Raw files they contain.

    RawDigger available here http://www.rawdigger.com/

    Please post your findings.

    Frame000339-RawDigger_Mosaic_Zoomed.png
    2566 x 1592 - 177K
  • 1 Reply sorted by
  • We already have more then enough suitable topics, you can use

    http://www.personal-view.com/talks/discussion/2975/black-magic-workflow#Item_19

    Or topic for test footage.

This topic is closed.
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