DPX
| Filename extension | |
|---|---|
| Developed by | SMPTE |
| Initial release | 1.0 / 18 February 1994 |
| Latest release |
2.0
(2003) |
| Type of format | Image file formats |
| Extended from | Cineon |
| Standard | ST 268:2003 |
| Open format? | non-free SMPTE standard, 17 pages, USD 120 |
| Website | www |
Digital Picture Exchange (DPX) is a common file format for digital intermediate and visual effects work and is an ANSI/SMPTE standard (268M-2003). The file format is most commonly used to represent the density of each colour channel of a scanned negative film in an uncompressed "logarithmic" image where the 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 (.cin 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. The specification was later improved and its latest version (2.0) is published by SMPTE as ANSI/SMPTE 268M-2003.
SMPTE Specifications dictate a mild number of compulsory metadata, like image resolution, color space details (channel depth, colorimetric metric, etc.), number of planes/subimages, as well as original filename and creation date/time, creator's name, project name, copyright information, and so on.
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