draft-seantek-windows-image-01.txt   draft-seantek-windows-image-02.txt 
Network Working Group S. Leonard Network Working Group S. Leonard
Internet-Draft Penango, Inc. Internet-Draft Penango, Inc.
Intended Status: Informational September 4, 2015 Intended Status: Informational March 6, 2016
Expires: March 7, 2016 Expires: September 7, 2016
Windows Image Media Types Windows Image Media Types
draft-seantek-windows-image-01 draft-seantek-windows-image-02
Abstract Abstract
This document registers media types for certain image formats This document registers media types for certain image formats
promulgated in Microsoft Windows, namely image/wmf, image/x-wmf, promulgated in Microsoft Windows, namely image/wmf, image/x-wmf,
image/emf, image/x-emf, and image/bmp for use with Windows Metafile, image/emf, image/x-emf, and image/bmp for use with Windows Metafile,
Enhanced Metafile, and Windows Bitmap formats. Originally designed Enhanced Metafile, and Windows Bitmap formats. Originally designed
for Microsoft Windows 2.0 and 3.0, these image files are intended to for Microsoft Windows 2.0 and 3.0, these image files are intended to
be portable between applications and devices, and may contain both be portable between applications and devices, and may contain both
vector and raster graphics. vector and raster graphics.
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Many implementations of WMF and EMF were created because of Windows' Many implementations of WMF and EMF were created because of Windows'
commercial success in the 1990s. A large body of free and commercial success in the 1990s. A large body of free and
commercially available clip art and other artwork exists in this commercially available clip art and other artwork exists in this
format. Furthermore, WMF content appears non-normatively in certain format. Furthermore, WMF content appears non-normatively in certain
standards (e.g., [OOXML]); the usage is common enough that an standards (e.g., [OOXML]); the usage is common enough that an
implementer would almost certainly need to support it for basic implementer would almost certainly need to support it for basic
interoperability. interoperability.
Microsoft publicly documented the WMF format as early as the 1992 Microsoft publicly documented the WMF format as early as the 1992
Windows 3.1 SDK. Since 2007 Microsoft has released the format Windows 3.1 SDK. Since 2007 Microsoft has released the format
specifications [MS-WMF] and [MS-EMF] under its Open Specification specifications [MS-WMF], [MS-EMF], and [MS-EMF+] under its Open
Promise [MS-OSP]. Specification Promise [MS-OSP].
1.2. Windows Bitmaps 1.2. Windows Bitmaps
Long before the invention of Portable Network Graphics (PNG), Long before the invention of Portable Network Graphics (PNG),
Microsoft Corporation and IBM Corporation needed to record images in Microsoft Corporation and IBM Corporation needed to record images in
a format that their applications and operating systems could easily a format that their applications and operating systems could easily
render on low-end machines (Intel 80286). The resulting "BMP" format render on low-end machines (Intel 80286). The resulting "BMP" format
contains a single raster graphic with basic header fields that can be contains a single raster graphic with basic header fields that can be
easily mapped (or "blitted") to locations in memory. As computing easily mapped (or "blitted") to locations in memory. As computing
moved from 16-bit to 32-bit, BMP evolved to contain 32-bit moved from 16-bit to 32-bit, BMP evolved to contain 32-bit
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