Editing Digital Picture Exchange (section)

{{Short description|Image file format family}}
{{redirect|DPX|text=DPX is also the name given to a mounting medium, see [[Dibutyl phthalate|Di-n-butyl phthalate]] in [[Xylene]]}}
{{ Infobox file format
| name          = Digital Picture Exchange
| extension     = <code>.dpx</code>
| mime          = 
| developer     = [[SMPTE]]
| released      = 1.0 / {{Start date and age|1994|02|18|df=yes}}
| latest release version = 2.0HDR
| latest release date    = {{Start date and age|2018}}
| creatorcode   = 
| genre         = [[Image file formats]]
| standard      = ST 268-1:2014,<ref>{{cite book|doi=10.5594/SMPTE.ST268-1.2014|isbn=978-1-68303-083-6|publisher=[[SMPTE]]|title=ST 268-1:2014 - SMPTE Standard - File Format for Digital Moving-Picture Exchange (DPX)}}</ref> ST 268-2:2018<ref>{{cite book|doi=10.5594/SMPTE.ST268-2.2018|isbn=978-1-68303-161-1|publisher=[[SMPTE]]|title=ST 268-2:2018 - SMPTE Standard - Digital Moving-Picture Exchange (DPX) – Format Extensions for High Dynamic Range and Wide Color Gamut|s2cid=252588275 }}</ref>
| open          = non-free [[SMPTE]] standard, USD 175 
| container for = 
| extended from = [[Cineon]]
| url           = {{URL|http://www.smpte.org/}}
}}

'''Digital Picture Exchange''' ('''DPX''') is a common [[file format]] for [[digital intermediate]] and [[visual effects]] work and is a [[SMPTE]] standard (ST 268-1:2014). The file format is most commonly used to represent the [[Optical density|density]] of each colour channel of a scanned negative film in an uncompressed "[[logarithmic scale|logarithmic]]" image where the [[Gamma correction|gamma]] of the [[original camera negative]] is preserved as taken by a [[film scanner]]. For this reason, DPX is the worldwide-chosen format for still frames storage in most digital intermediate post-production facilities and film labs. Other common video formats are supported as well (see below), from video to purely digital ones, making DPX a file format suitable for almost any raster digital imaging applications. DPX provides, in fact, a great deal of flexibility in storing colour information, colour spaces and colour planes for exchange between production facilities. Multiple forms of packing and alignment are possible. The DPX specification allows for a wide variety of metadata to further clarify information stored (and storable) within each file.

The DPX file format was originally derived from the [[Kodak]] [[Cineon]] open file format (<code>.cin</code> file extension) used for digital images generated by Kodak's original [[film scanner]]. The original DPX (version 1.0) specifications are part of SMPTE 268M-1994.<ref>{{cite web|url=http://www.cineon.com/ff_draft.php|title=Cineon Image File Format Draft|publisher=[[Cineon]]|access-date=2014-03-01|archive-url=https://web.archive.org/web/20130529225913/http://www.cineon.com/ff_draft.php|archive-date=2013-05-29|url-status=dead}}</ref> The specification was later improved and published by [[SMPTE]] as [[American National Standards Institute|ANSI]]/SMPTE 268M-2003. Academy Density Exchange (ADX) support for the [[Academy Color Encoding System]] are added in the current version of the standard SMPTE ST 268-1:2014. Extensions for [[high-dynamic-range video]] and [[wide color gamut]] are standardized in SMPTE ST 268-2:2018.