NEF File

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One D5100/D7000 NEF file contains 4 pictures:

  1. Uncompressed thumbnail 160 x 120
  2. Full scaled jpeg (L size) 4928 x 3264
  3. Full scaled Huffman compressed RAW picture (14-bit) 4992 x 3280
  4. Jpeg thumbnail (in Exif MakerNote tag) 576 x 375

There is a utility to dump contents of Nikon Electronic Format File (NEF).