DI工作中最重要的文件格式之一
DPX是在柯达公司的 Cineon文件格式发展出的基于位图(bitmap)的文件格式。它是SMPTE在Cineon文件格式的基础上加上一系列头文件(header information)后的格式。它是用来储存和表达运动图画或视频流的每一个完整帧而发展出的格式。多个DPX文件可以表示运动图画的片断和序列，用于在多种电子和计算机设备上交换和处理这些以完整帧为单位的运动视频。有多种应用软件支持DPX格式，如NUKE，Davinci resolve ,Baselight，SGO Mistika， Combustion,Shake,Maya,Fusion,Avid DS,蓝鱼的 Symmetry 等等。它是数字电影和DI工作中最重要的文件格式之一。
但是，很少有方案能原始地支持DPX并能准确地采集、生成、和回放DPX文件。一些所谓的能够支持DPX格式的视频I/O使用价格低廉的“代理”转换软件如Quick Time Component或其他零售软件。这样会有很危险和不划算的可能：即那些很重要的头文件信息“header information”会在转换过程中丢失或改变，这些头文件含有重要信息如：每行的像素数量，每个画面的元素数量，色彩表述等等。头文件的损失将会影响最终画面的很多元素和指标。
由于DPX格式常用于高质量的合成、数字电影、和胶片电影等应用，所以应该尽量避免使用以软“代理”软件转换的任何方案。应该使用基于硬件的、原始处理 DPX和Cineon文件的方案。
Digital Picture Exchange (DPX) is a common file format for digital intermediate and visual effects work and is an ANSI/SMPTE standard (268M-2003).[2] 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.[3] The specification was later improved and its latest version (2.0) is published by SMPTE as ANSI/SMPTE 268M-2003.
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