Radiance HDR

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|formattype=electronic
 
|formattype=electronic
 
|subcat=Graphics
 
|subcat=Graphics
|extensions={{ext|hdr}}, {{ext|rgbe}}, {{ext|xyze}}, {{ext|pic}}  
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|extensions={{ext|hdr}}, {{ext|rgbe}}, {{ext|xyze}}, {{ext|pic}}, {{ext|rad}}  
 
|mimetypes={{mimetype|image/vnd.radiance}}
 
|mimetypes={{mimetype|image/vnd.radiance}}
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|pronom={{PRONOM|fmt/591}}
 
}}
 
}}
== Overview ==
 
 
'''Radiance HDR''', also known as '''RGBE''' or '''Radiance Picture''', is raster image file format associated with the ''Radiance'' (or ''RADIANCE'') lighting simulation software by Greg Ward. It supports ''high dynamic range'' imaging, and may have been one of the first formats to do so.
 
'''Radiance HDR''', also known as '''RGBE''' or '''Radiance Picture''', is raster image file format associated with the ''Radiance'' (or ''RADIANCE'') lighting simulation software by Greg Ward. It supports ''high dynamic range'' imaging, and may have been one of the first formats to do so.
  
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There are at least two versions of the format. The documentation for the ra_rgbe utility says "The file format for RADIANCE pictures was changed between release 1.4 and release 2.0."
 
There are at least two versions of the format. The documentation for the ra_rgbe utility says "The file format for RADIANCE pictures was changed between release 1.4 and release 2.0."
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== Identifiers ==
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The official filename extensions are '''.pic''', '''.hdr''', '''.rgbe''', and '''.xyze'''. Some third-party applications use '''.rad''', though that conflicts with [[Radiance Scene Description]] format. Some sources say that '''.img''' is also used.
  
 
== Identification ==
 
== Identification ==
Many sources claim that filename extensions '''.rad''' and '''.img''' are also used, though '''.rad''' seems unlikely because it is used for [[Radiance Scene Description]] format.
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Files are supposed to begin with an ASCII signature of "<code>#?RADIANCE</code>". However, some apparently begin with "<code>#?RGBE</code>" instead, and some have no signature line at all. Note that some of Radiance's other file formats also use the "<code>#?RADIANCE</code>" signature.
 
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Files begin with an ASCII signature of "<code>#?RADIANCE</code>" or, apparently, "<code>#?RGBE</code>". Note that some of Radiance's other file formats also use the "<code>#?RADIANCE</code>" signature.
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== Specifications ==
 
== Specifications ==
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== Software ==
 
== Software ==
 
* [http://radsite.lbl.gov/radiance/dist/ Radiance source code]
 
* [http://radsite.lbl.gov/radiance/dist/ Radiance source code]
* [http://www.imagemagick.org/ ImageMagick] (format named "HDR")
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* [[ImageMagick]] (format named "HDR")
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* [[Konvertor]]
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* [[XnView]]
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* [http://pfstools.sourceforge.net/index.html pfstools]
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== Sample files ==
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* [http://pfstools.sourceforge.net/hdr_gallery.html HDR Image Gallery] (also [http://sourceforge.net/p/pfstools/code/HEAD/tree/webpage/trunk/hdr_gallery/ here])
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* http://radsite.lbl.gov/radiance/pub/pics/index.html
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== See also ==
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* [[JPEG-HDR]]
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* [[packPNM]]
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* [[Radiance Scene Description]]
  
 
== Links ==
 
== Links ==
 
* [http://radsite.lbl.gov/radiance/ Radiance web site]
 
* [http://radsite.lbl.gov/radiance/ Radiance web site]
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* [[Wikipedia:RGBE image format|Wikipedia: RGBE image format]]
 
* [[Wikipedia:Radiance (software)|Wikipedia: Radiance]]
 
* [[Wikipedia:Radiance (software)|Wikipedia: Radiance]]
 
* [http://www.iana.org/assignments/media-types/image/vnd.radiance Media type registration]
 
* [http://www.iana.org/assignments/media-types/image/vnd.radiance Media type registration]

Revision as of 17:24, 16 May 2016

File Format
Name Radiance HDR
Ontology
Extension(s) .hdr, .rgbe, .xyze, .pic, .rad
MIME Type(s) image/vnd.radiance
PRONOM fmt/591

Radiance HDR, also known as RGBE or Radiance Picture, is raster image file format associated with the Radiance (or RADIANCE) lighting simulation software by Greg Ward. It supports high dynamic range imaging, and may have been one of the first formats to do so.

Contents

Format

Each pixel is encoded as four bytes: three color values (RGB or XYZ), and a shared exponent.

There are at least two versions of the format. The documentation for the ra_rgbe utility says "The file format for RADIANCE pictures was changed between release 1.4 and release 2.0."

Identifiers

The official filename extensions are .pic, .hdr, .rgbe, and .xyze. Some third-party applications use .rad, though that conflicts with Radiance Scene Description format. Some sources say that .img is also used.

Identification

Files are supposed to begin with an ASCII signature of "#?RADIANCE". However, some apparently begin with "#?RGBE" instead, and some have no signature line at all. Note that some of Radiance's other file formats also use the "#?RADIANCE" signature.

Specifications

Software

Sample files

See also

Links

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