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# jxrlib | ||
### JPEG XR Format | ||
JPEG XR is a still image format based on | ||
technology originally developed by Mirosoft under the name HD Photo (formerly | ||
Windows Media™ Photo). The JPEG XR format is similar, but not identical, to the | ||
HD Photo/Windows Media™ Photo format. | ||
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The JPEG XR format replaces the HD Photo/Windows Media™ Photo format in both | ||
Windows 8 and the Windows Image Component (WIC). WIC accompanies the Internet | ||
Explorer 10 redistributable packages for down-level versions of Windows. | ||
Some “Windows Media™ Photo” (WMP) naming conventions are still used internally | ||
with this release of the DPK. | ||
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JPEG XR files use the .jxr extension. Applications that support the JPEG XR | ||
file format should recognize and decode HD Photo/Windows Media™ Photo | ||
.hdp/.wdp files, but only offer to create files with the .jxr extension. | ||
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### JPEG XR Image Coding Specification | ||
The JPEG XR Image Coding Spectification provides a detailed specification of the | ||
compression encoder and decoder algorithms plus the detailed structure of the | ||
compressed data (elementary) bit stream. This document is designed to be used in | ||
conjunction with the included source code. If you find instances where the code | ||
differs from the documentation, the code implementation should be used as the | ||
reference. | ||
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The JPEG XR Image Coding Spectification is an international standard and is | ||
available at: http://www.itu.int/rec/T-REC-T.832 while the reference software is | ||
available at: http://www.itu.int/rec/T-REC-T.835. | ||
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### Status of JPEG XR implementation | ||
"JPEGXR_DPK_1.0.doc" documents the contents of this porting kit, the usage of | ||
the command line file conversion utilities (JXREncApp.exe and JXRDecApp.exe), and | ||
technical details of the API's and data structures between these sample command | ||
line applications and the core codec. | ||
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The code and documentation in this release represent the final design and | ||
specification of the 1.0 bit stream, and can be used as the reference for final | ||
implementations of encoders and decoders for JPEG XR. | ||
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This release of the DPK has received extensive testing of all the various pixel | ||
formats, encoder options and modes of operation. We are confident that most errors | ||
and other bugs have been resolved. Any code bugs, documentation errors or other | ||
discrepancies found in this release candidate should be reported to Microsoft as | ||
promptly as possible. These can be submitted to hdview@microsoft.com. | ||
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This DPK provides basic support for big endian architectures. We have | ||
successfully tested the encoder and decoder using a big endian processor. This | ||
support is provided as a starting reference to be adapted to the specific | ||
platform and hardware architecture of the target system. | ||
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### Contact Information | ||
For any and all technical questions or feedback about any part of this Device | ||
Porting Kit, including the documentation, please send email to: | ||
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hdview@microsoft.com | ||
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We will respond as promptly as possible with answers to your questions. | ||
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Additional information, best practices, tools, utilities, sample code, sample | ||
image content, links to additional resources and community discussion can | ||
currently be found at http://hdview.wordpress.com/. | ||
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#### The Microsoft JPEG XR Development Team | ||
### Interesting links | ||
[JPEG XR Updates](https://hdview.wordpress.com/2013/05/30/jpegxr-updates/) | ||
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[JPEG XR Photoshop Plugin and Source Code](https://hdview.wordpress.com/2013/04/11/jpegxr-photoshop-plugin-and-source-code/) |