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1. #DEFINE METAIMAGE MANUALS#
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WMF and EMF files handle object processing differently to EMF+ records in EMF files. The object table is an associative array of indexes to graphical object structures defined within the metafile. Each of these objects are stored in metafiles and are placed into an object table, which tracks the usage of graphic objects while processing the metafile. pens specify the color and width of lines). Some records define objects which can specify graphical objects used to determine how graphics should be drawn (e.g.

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WMF, EMF and EMF+ files all consist of a series of records that are played back to produce graphical output.

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Metafile structure Ĭomparison of Windows Metafiles – note that WMF files can include EMF+ records With the release of Windows XP and GDI+, the set of records had to be significantly increased and so Microsoft released EMF+ as an extension to the existing EMF file format. Thus, in 1992 with Windows NT 3.1, Microsoft introduced the Enhanced Metafile format (EMF) - a format which was based on the Win32 API and with which they built-in in device independence. Others added headers to the metafile that provided various application-specific information", causing major compatibility issues. Microsoft found that developers who use the format were " application, location, or scaling comments in the metafiles. Microsoft later deprecated WMF files in favour of 32-bit EMF files as WMF files had real issues with device independence, despite the use of a "placeable" file header which provided basic device independence.

In September 2006, Microsoft again published the WMF file format specification in a more complete form in the context of the Microsoft Open Specification Promise, promising to not assert patent rights to file format implementors. Over time the existence of that historic specification was largely forgotten and some alternative implementations resorted to reverse engineering to figure out the file format from existing WMF files, which was difficult and error prone.

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These manuals were published as printed books available in bookstores with no click through EULA or other unusual licensing restrictions (just a general warning that if purchased as part of a software bundle, the software would be subject to one). The original 16 bit WMF file format was fully specified in volume 4 of the 1992 Windows 3.1 SDK documentation (at least if combined with the descriptions of the individual functions and structures in the other volumes), but that specification was vague about a few details. EMF+ is an extension to EMF files and embedded in these comment records, allowing for images and text using commands, objects and properties that are similar to Windows GDI+. EMF files, which replaced WMF files, work on the same principle only it is a 32-bit file format that also allows for the embedding of private data within "comment" records.

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As of 2017 revision 14 of the Windows Metafile Format specification is available for online reading or download as PDF. It is the native vector format for Microsoft Office applications such as Word, PowerPoint, and Publisher. There are three major types of metafiles – a WMF is a 16-bit format introduced in Windows 3.0. The drawing commands used are closely related to the commands of the Graphics Device Interface (GDI) API used for drawing in Microsoft Windows. EMF files were then themselves enhanced via EMF+ files.Įssentially, a metafile stores a list of records consisting of drawing commands, property definitions and graphics objects to display an image on screen. WMF files were later superseded by Enhanced Metafiles (EMF files) which did provide for device-independence. It acts in a similar manner to SVG files. The original Windows Metafile format was not device-independent (though could be made more so with placement headers) and may contain both vector graphics and bitmap components. This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.Windows Metafile ( WMF) is an image file format originally designed for Microsoft Windows in the 1990s.