## Radiance Tags

Information extracted from Radiance RGBE HDR images. Tag ID's are all uppercase as stored in the file, but converted to lowercase by when extracting to avoid conflicts with internal ExifTool variables. See http://radsite.lbl.gov/radiance/refer/filefmts.pdf and http://www.graphics.cornell.edu/online/formats/rgbe/ for the specification.

> Tag ID | Tag Name | Writable | Values / Notes
> --- | --- | --- | ---
> '_command' | Command | N |

> '_orient'

> Orientation

> N

> '+X +Y' = Rotate 90 CW
> '+X -Y' = Mirror horizontal and rotate 270 CW
> '+Y +X' = Mirror vertical
> '+Y -X' = Rotate 180
> '-X +Y' = Mirror horizontal and rotate 90 CW
> '-X -Y' = Rotate 270 CW
> '-Y +X' = Horizontal (normal)
> '-Y -X' = Mirror horizontal

> 'colorcorr' | ColorCorrection | N |
> 'exposure' | Exposure | N | (divide pixel values by this to get watts/steradian/meter^2)
> 'format' | Format | N |
> 'gamma' | Gamma | N |
> 'pixaspect' | PixelAspectRatio | N |
> 'primaries' | ColorPrimaries | N |
> 'software' | Software | N |
> 'view' | View | N |

(This document generated automatically by Image::ExifTool::BuildTagLookup)
Last revised Dec 14, 2011

<-- ExifTool Tag Names