Difference between revisions of "Nikon Electronic Format"

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[[Main Page]] > [[Documentation]] > [[Format-specific preservation plans]] > Nikon Electronic Format
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[[Main Page]] > [[Documentation]] > [[Media type preservation plans]] > Nikon Electronic Format
  
  
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===File extension(s)===
 
===File extension(s)===
*.nef
+
.nef
  
 
===Format registry information===
 
===Format registry information===
*[http://www.nationalarchives.gov.uk/PRONOM/Format/proFormatSearch.aspx?status=detailReport&id=927 PRONOM]
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[http://www.nationalarchives.gov.uk/PRONOM/Format/proFormatSearch.aspx?status=detailReport&id=927 PRONOM]
  
===Significant properties===
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===Significant characteristics===
*See [[Significant properties of raster images]]
+
See [[Significant characteristics of raster images]]
  
 
===Preservation action plan===
 
===Preservation action plan===
 +
See [[Raw camera files]]
  
 
===Preservation issues===
 
===Preservation issues===
 
*NEF is a proprietary format with an unpublished specification.
 
*NEF is a proprietary format with an unpublished specification.
 
*NEF files can be very large - 70 MB or more.
 
*NEF files can be very large - 70 MB or more.
*Xena incorrectly guesses the file type as TIFF and normalizes as it would a TIFF, with the result that a very large file (e.g. 70 MB) is normalized to a very small one (eg. 250 KB) with considerable loss of data. Changes to the raw file (ie: alterations done in image editing software) are stored in a separate XMP file, which Xena also does not recognize, and does not normalize together. This means that any edits added by the creator are removed.
 
*Possible preservation plan is normalization to Adobe Digital Negative (DNG) format
 
**Library of Congress states that [http://www.digitalpreservation.gov/formats/fdd/fdd000188.shtml Adobe Digital Negative (DNG), Version 1.1] may be emerging as a standard preservation format for raw camera images.
 
***Adobe provides a free (but not open-source) [http://www.adobe.com/products/dng/ Adobe DNG Converter] designed for downloading to Windows or Mac computers.
 
***An open-source option for converting RAW image files to DNG is [http://www.digikam.org/ DigiKam] DNGConverter.
 
*Another preservation option is conversion to JPEG2000 using [http://www.imagemagick.org/script/index.php ImageMagick]
 
  
 
===Conversion test results===
 
===Conversion test results===
 
*[[NEF to DNG using DNGConverter]]
 
*[[NEF to DNG using DNGConverter]]
 
===Access format===
 
  
 
===More information===
 
===More information===
 
*NEF is a raw (i.e. pre-processed) image format produced by Nikon cameras.
 
*NEF is a raw (i.e. pre-processed) image format produced by Nikon cameras.
 
*Information on NEF files is available at [http://www.digitalpreservation.gov/formats/fdd/fdd000241.shtml Library of Congress Sustainability of Digital Formats: Camera Raw Formats].
 
*Information on NEF files is available at [http://www.digitalpreservation.gov/formats/fdd/fdd000241.shtml Library of Congress Sustainability of Digital Formats: Camera Raw Formats].
*For more information on JPEG2000 see [http://www.updig.org/guidelines/ph_archiving.html Universal Photographic Digital Imaging Guidelines: Archiving] and [http://www.dpconline.org/docs/reports/dpctw08-01.pdf Technology Watch Support:JPEG 2000 - a Practical Digital Preservation Standard? Digital Preservation Coalition 2008].
 
  
  
 
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Latest revision as of 16:08, 29 March 2011

Main Page > Documentation > Media type preservation plans > Nikon Electronic Format


Also known as[edit]

  • NEF
  • Nikon Image Format
  • Nikon Digital SLR Camera Raw Image File

File extension(s)[edit]

.nef

Format registry information[edit]

PRONOM

Significant characteristics[edit]

See Significant characteristics of raster images

Preservation action plan[edit]

See Raw camera files

Preservation issues[edit]

  • NEF is a proprietary format with an unpublished specification.
  • NEF files can be very large - 70 MB or more.

Conversion test results[edit]

More information[edit]