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DPX (Digital Picture Exchange)
The industry standard for digital intermediate and visual effects work in film.
Digital Picture Exchange (DPX) is a raster image format used primarily in the motion picture industry for visual effects (VFX) and Digital Intermediate (DI) work. It is an ANSI/SMPTE standard (SMPTE 268M-2003) designed to represent the density of film scans without loss of quality. Unlike consumer formats, DPX is usually uncompressed and stores color information in a 'logarithmic' (Log) format to preserve the full dynamic range of motion picture film. A single second of 4K movie footage in DPX format can consume enormous amounts of storage (hundreds of megabytes), making it strictly a production format, not one for distribution.
A DPX file starts with a 'Generic Image Header' (magic number: SDPX) containing core details like file size and image orientation. This is followed by 'Industry Specific Headers' for Motion Picture or Television data (timecodes, frame rates). Finally, the 'Image Data' block contains the raw pixel values. DPX supports a wide variety of bit depths, but 10-bit Log RGB is the most common industry standard. It packs these 10-bit values tightly into 32-bit words (10+10+10+2 padding) for efficient processing. The logarithmic encoding mimics the human eye's response to light and the physical characteristics of film stock.
DPX is the direct successor to Kodak's Cineon (.cin) format, which was developed in the early 1990s for the first digital film scanners. As the industry moved towards digital workflows, SMPTE (Society of Motion Picture and Television Engineers) standardized Cineon into DPX to ensure compatibility between different vendors' scanners, printers, and software.
WordPerfect Graphics
The clip art format of the WordPerfect era.
WPG (WordPerfect Graphics) is a file format associated with Corel's WordPerfect word processor. It can contain both vector graphics (lines, curves) and raster graphics (bitmaps), making it a 'metafile' similar to WMF.
There are two main versions: WPG1 (WordPerfect 5.0) and WPG2 (WordPerfect 6.0). WPG1 is strictly 16-color or 256-color. WPG2 supports up to 24-bit color and more advanced vector commands. ImageMagick primarily supports reading the raster components.
Dominant in the late 80s/early 90s when WordPerfect was the market leader for word processing, before the rise of Microsoft Word.
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