RAF is the RAW file format used by FujiFilm camera. It looks like a simple table with embedded JPEG some data and uncompressed CFA.

MIME type

image/x-fuji-raf

Organisation

Byte order is Motorola (Big Endian)

  • 16 bytes string to identify the file (magic)
    • FUJIFILMCCD-RAW
  • 4 bytes
    • 0201
  • 8 bytes
    • FF389501
  • 32 bytes for the camera string, \0 terminated
  • offset directory
    • Version (4 bytes) for the directory
      • 0100
      • 0159
    • 20 bytes “unknown”
    • Jpeg image offset (4 bytes)
    • Jpeg Image length (4 bytes)
    • CFA Header Offset (4 bytes)
    • CFA Header Length (4 bytes)
    • CFA Offset (4 bytes)
    • CFA Length (4 bytes)
    • rest unused
  • Jpeg image offset
    • Exif JFIF with thumbnail + preview
  • CFA Header offset - Big Endian
    • 4 bytes: count of records
    • Records, one after the other
      • 2 bytes: tag ID
      • 2 bytes: size of record (N)
      • N bytes: data
  • CFA Offset
    • Uncompressed RAW

Compression

Recent X-series camera like X-Pro2, X-T3 add an optional compression.

LibRaw compressed file support

Links