? ? ? ?DPX是在柯達(dá)公司的 Cineon文件格式發(fā)展出的基于位圖(bitmap)的文件格式。它是SMPTE在Cineon文件格式的基礎(chǔ)上加上一系列頭文件(header information)后的格式。它是用來儲存和表達(dá)運動圖畫或視頻流的每一個完整幀而發(fā)展出的格式。多個DPX文件可以表示運動圖畫的片斷和序列，用于在多種電子和計算機設(shè)備上交換和處理這些以完整幀為單位的運動視頻。有多種應(yīng)用軟件支持DPX格式，如NUKE，Davinci resolve ,Baselight，SGO?Mistika， Combustion,Shake,Maya,Fusion,Avid DS,藍(lán)魚的 Symmetry 等等。它是數(shù)字電影和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并能準(zhǔn)確地采集、生成、和回放DPX文件。一些所謂的能夠支持DPX格式的視頻I/O使用價格低廉的“代理”轉(zhuǎn)換軟件如Quick Time Component或其他零售軟件。這樣會有很危險和不劃算的可能：即那些很重要的頭文件信息“header information”會在轉(zhuǎn)換過程中丟失或改變，這些頭文件含有重要信息如：每行的像素數(shù)量，每個畫面的元素數(shù)量，色彩表述等等。頭文件的損失將會影響最終畫面的很多元素和指標(biāo)。

　　 由于DPX格式常用于高質(zhì)量的合成、數(shù)字電影、和膠片電影等應(yīng)用，所以應(yīng)該盡量避免使用以軟“代理”軟件轉(zhuǎn)換的任何方案。應(yīng)該使用基于硬件的、原始處理 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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