Editing Digital Negative (section)

==Standardization==
DNG is not a standard format, but is based on several [[open format]]s or [[Open standard|standards]] and is being used by ISO in its revision of [[Tag Image File Format / Electronic Photography|TIFF/EP]]. A timeline:
* ''2001'': The ISO standard raw image format, ISO 12234-2, better known as TIFF/EP, was ratified and published.  It also supports "non-raw", or "processed", images. TIFF/EP provided a basis for the raw image formats of a number of cameras, but they typically added their own proprietary data. Some cameras have sensors that cannot be described by that version of TIFF/EP.
* ''2004, September'': Adobe launched DNG.  Its specification states it "is compatible with the TIFF-EP standard".<ref name = "DNGspecification"/>  It is a TIFF/EP extension with considerably more specified metadata, brought up-to-date and made fit for purpose.  DNG also exploits various other [[open format]]s and [[Open standard|standards]], including [[Exchangeable image file format|Exif metadata]], [[Extensible Metadata Platform|XMP metadata]], [[International Press Telecommunications Council|IPTC metadata]], [[CIE 1931 color space|CIE XYZ coordinates]], [[ICC profile]]s, and [[JPEG]].<ref name="PEARSONstandards">Barry Pearson: [http://www.barrypearson.co.uk/articles/dng/specification.htm#standards DNG's relationship to standards]</ref><ref name = " DNGspecification" /> Although DNG supports more sensor configurations than TIFF/EP (for example, cameras from [[Fujifilm]] using [[Super CCD]] sensors), it still doesn't support all sensor types as raw images, especially those using the [[Foveon X3 sensor]] or similar, hence especially [[Sigma Corporation|Sigma]] cameras.
* ''2006'': TIFF/EP began its 5-year revision cycle.
* ''2006 to 2007'': Adobe offered the DNG specification to ISO to be part of ISO's revised TIFF/EP standard.<ref name = "DPReviewISO">{{Citation | date = May 15, 2008 | access-date = December 11, 2014 | quote = Adobe is submitting its DNG 'universal RAW' format to the International Standard's Organization (ISO), in a move aimed at increasing acceptance and usage. The format is being proposed as part of ISO's TIFF/EP (electronic photography), standard. | newspaper = DPReview | url = http://www.dpreview.com/news/0805/08051503adobeDNG.asp | title=Adobe seeks International recognition for DNG | author=dpreview staff }}.</ref><ref>{{Citation | format = archive | type = mailing list | title = Digikam-devel | date = 26 April 2007 | url = http://mail.kde.org/pipermail/digikam-devel/2007-April/012129.html | author = A member of the ISO TC42 (technical committee for photography) working group 18 (electronic imaging) standards group}}.</ref>
* ''2008, September & October'': Minutes of ISO/TC 130/WG2 — Prepress Data Exchange, 37th Meeting: "WG 18 is revising the two-part standard (ISO 12234), which addresses digital camera removable memory. The revision of... Part 2 will add DNG into TIFF/EP." A progress report from ISO about the revision of TIFF/EP stated that the revision "...currently includes two "interoperability-profiles," "IP 1" for processed image data, using ".TIF" extension, and "IP 2" for "raw" image data, ".DNG" extension".<ref>{{Citation | publisher = I3A (International Imaging Industry Association) | url = http://www.i3a.org/news/newsletters/eye-on-standards/eye-on-standards-october-2008/#working_group_reports | date = October 2008 | type = working group report | newspaper = Eye on standards | title = ISO 12234 Part 2 – TIFF/EP | at = down a bit | url-status = usurped | archive-url = https://web.archive.org/web/20081023232343/http://www.i3a.org/news/newsletters/eye-on-standards/eye-on-standards-october-2008/#working_group_reports | archive-date = 2008-10-23 }}.</ref>
* ''2009, September'': Minutes of ISO/TC 130/WG2 — Prepress Data Exchange, 39th Meeting: the revision of TIFF/EP "is comprehensive to support many different use cases, including backward compatibility with current TIFF readers and support of Adobe DNG... Profile 2 (proposed extension .dng, if Adobe is in agreement) is intended for camera raw images, including un-demosaiced images... This format will be similar to DNG 1.3, which serves as the starting point for development."<ref>{{Citation | publisher = NPES | url = http://www.npes.org/pdf/TC130WG2N1363_Minutes-Beijing-Sept09.pdf | date = September 2009 | place = Peking, China | title = Minutes of ISO/TC 130/WG2, 39th Meeting | at = 14f | access-date = 2009-11-06 | archive-date = 2012-01-11 | archive-url = https://web.archive.org/web/20120111151106/http://www.npes.org/pdf/TC130WG2N1363_Minutes-Beijing-Sept09.pdf | url-status = dead }}.</ref>