Radiance RGBE Image Format

Writable

image

Radiance defined an image format for storing HDR images, now described as RGBE image format. RGBE stores pixels as one byte each for RGB (red, green, and blue) values with a one byte shared exponent. Thus it stores four bytes per pixel.

Identify it

Extensions	`.hdr.rgbe.xyze.pic.rad`
MIME types	`image/vnd.radiance`
Signatures	`233f52414449414e43450a` at byte 0 (Radiance)
PRONOM	`fmt/591`
Wikidata	`Q3928271`

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Open it

ImageMagickOpen sourcereads and writes · ImageMagick License
Q141647655Open sourcereads and writes · Apache Software License 2.0 / MIT License
AbydosOpen sourcereads · GNU Lesser General Public License
ConverseenOpen sourcereads · GNU General Public License, version 3.0
ExifToolOpen sourcereads · Artistic License / GNU General Public License, version 1.0 or later
GodotOpen sourcereads · MIT License
Q130252332Open sourcereads · Apache Software License 2.0 / Creative Commons Attribution 4.0 International / MIT License
Affinity Photoreads and writes
Axialis IconWorkshopreads and writes
Radiancereads and writes
Zoner Photo Studioreads and writes
ABViewerreads
Adobe After Effectsreads · proprietary license
Q129793reads · shareware

Convert it

To	With	Fidelity	Command and losses
Portable Network Graphics	ImageMagick	Lossless	`convert in.hdr out.png` Pixels kept; some metadata, colour profiles or layers may be dropped.
Tagged Image File Format	ImageMagick	Lossless	`convert in.hdr out.tif` Pixels kept; some metadata, colour profiles or layers may be dropped.
GIF 89a	ImageMagick	Lossy	`convert in.hdr out.gif` Reduced to 256 colours.
JPEG File Interchange Format 1.02	ImageMagick	Lossy	`convert in.hdr out.jpg` Lossy compression.
WebP	ImageMagick	Lossy	`convert in.hdr out.webp` Lossy compression.

Sources

From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.

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