Technical discussion of the DNG files made by Blackmagic Cinema Camera

vicx — Sat, 25 Aug 2012 04:03:29 +0000

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.

Tagged with technical - Personal View Talks

Technical discussion of the DNG files made by Blackmagic Cinema Camera