libdng

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