Inside a DNG file
- SubIFDType 0 is the original raw data
- SubIFDType 1 is the thumbnail data
- The recommendation is to store the thumbnail as the first IFD
- TIFF metdata goes in the first IFD
- EXIF tags are preferred
- Camera profiles are stored in the first IFD
Required tags
- DNGVersion
- UniqueCameraModel
Neat tags
- AnalogBalance stores the gains applied to the RGB channels by the sensor