In 2014, everybody, especially Barack Obama, was talking about metadata. The government was denying looking at emails and cellphone texts but only at the metadata.

What is METADATA? It’s data about the data.

People think that raw files are the raw data from the CMOS sensor. It’s not. It’s a structured file that is standardized and that is made of various sections:

  • A header that lists the byte-ordering of the file, the file identifier and the offset into the main file data
  • The camera sensor data such as the size of the sensor, the color profile…
  • The EXIF data such as the exposure settings, the camera/lens model, date…
  • The Makers Notes: Fujifilm specific data
  • The thumbnail or the thumbnailS
  • The included JPEG
  • And finally, the image data as a black and white unprocessed TIFF image

Fujifilm Makers Notes

Key Tag description
Exif.Fujifilm.Version Fujifilm Makernote version
Exif.Fujifilm.SerialNumber This number is unique, and contains the date of manufacture, but is not the same as the number printed on the camera body.
Exif.Fujifilm.Quality Image quality setting
Exif.Fujifilm.Sharpness Sharpness setting
Exif.Fujifilm.WhiteBalance White balance setting
Exif.Fujifilm.Color Chroma saturation setting
Exif.Fujifilm.Tone Contrast setting
Exif.Fujifilm.FlashMode Flash firing mode setting
Exif.Fujifilm.FlashStrength Flash firing strength compensation setting
Exif.Fujifilm.Macro Macro mode setting
Exif.Fujifilm.FocusMode Focusing mode setting
Exif.Fujifilm.0x1022 Unknown
Exif.Fujifilm.SlowSync Slow synchro mode setting
Exif.Fujifilm.PictureMode Picture mode setting
Exif.Fujifilm.0x1032 Unknown
Exif.Fujifilm.Continuous Continuous shooting or auto bracketing setting
Exif.Fujifilm.SequenceNumber Sequence number
Exif.Fujifilm.0x1200 Unknown
Exif.Fujifilm.FinePixColor Fuji FinePix color setting
Exif.Fujifilm.BlurWarning Blur warning status
Exif.Fujifilm.FocusWarning Auto Focus warning status
Exif.Fujifilm.ExposureWarning Auto exposure warning status
Exif.Fujifilm.DynamicRange Dynamic range
Exif.Fujifilm.FilmMode Film mode
Exif.Fujifilm.DynamicRangeSetting Dynamic range settings
Exif.Fujifilm.DevelopmentDynamicRange Development dynamic range
Exif.Fujifilm.MinFocalLength Minimum focal length
Exif.Fujifilm.MaxFocalLength Maximum focal length
Exif.Fujifilm.MaxApertureAtMinFocal Maximum aperture at minimum focal
Exif.Fujifilm.MaxApertureAtMaxFocal Maximum aperture at maximum focal
Exif.Fujifilm.FileSource File source
Exif.Fujifilm.OrderNumber Order number
Exif.Fujifilm.FrameNumber Frame number

The JPEG previews/thumbnails

I’m using a program called exiv2 to display the location and size of the jpegs/thumbnails. I’ve added the comas for easier reading.

Fuji

exiv2 -pp /drive-b/pictures/@work/work-2017/cobbler-20170926-4566.raf

Preview 1: image/jpeg, 160x120 pixels, 8,798 bytes
Preview 2: image/jpeg, 1920x1280 pixels, 706,068 bytes

Only 1 thumbnail and 1 preview but the preview is not full size. It’s just as a 2.5k HD image: 1920 by 1280

Canon

exiv2 -pp /drive-b/pictures/@work/work-2013/construction-false-creek-20130402-2407.cr2

Preview 1: image/jpeg, 160x120 pixels, 15,286 bytes
Preview 2: image/tiff, 670x432 pixels, 1,736,640 bytes
Preview 3: image/jpeg, 5184x3456 pixels, 1,657,438 bytes

On the other hand with Canon there are 3 previews, including the full size highly compressed JPEG that is embedded in the raw file.