Radiance HDR

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`

Not sure your file is this? Identify it from its first bytes, in your browser.

Open it

ImageMagickOpen sourcereads and writes · ImageMagick License
ImageMagick (WebAssembly)Open sourcereads and writes · Apache-2.0
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

Convert a file in your browser The steps marked “in browser” run on your machine; nothing is uploaded.

To	With	Fidelity	Command and losses
BMP 5.0	ImageMagick (WebAssembly)	Lossless	in browser Pixels kept; some metadata, colour profiles or layers may be dropped.
PNG	ImageMagick	Lossless	`convert in.hdr out.png` Pixels kept; some metadata, colour profiles or layers may be dropped.
PNG	ImageMagick (WebAssembly)	Lossless	in browser Pixels kept; some metadata, colour profiles or layers may be dropped.
Quite OK Image Format	ImageMagick (WebAssembly)	Lossless	in browser Pixels kept; some metadata, colour profiles or layers may be dropped.
TIFF	ImageMagick	Lossless	`convert in.hdr out.tif` Pixels kept; some metadata, colour profiles or layers may be dropped.
TIFF	ImageMagick (WebAssembly)	Lossless	in browser Pixels kept; some metadata, colour profiles or layers may be dropped.
PDF	ImageMagick (WebAssembly)	Partial	in browser The image is embedded in a PDF page.
AVIF	ImageMagick (WebAssembly)	Lossy	in browser Lossy compression.
GIF 89a	ImageMagick	Lossy	`convert in.hdr out.gif` Reduced to 256 colours.
GIF 89a	ImageMagick (WebAssembly)	Lossy	in browser Reduced to 256 colours.
ICO	ImageMagick (WebAssembly)	Lossy	in browser Icons are limited to 256 × 256 pixels.
JFIF 1.02	ImageMagick	Lossy	`convert in.hdr out.jpg` Lossy compression.
JFIF 1.02	ImageMagick (WebAssembly)	Lossy	in browser Lossy compression.
JPEG XL	ImageMagick (WebAssembly)	Lossy	in browser Lossy compression.
WebP	ImageMagick	Lossy	`convert in.hdr out.webp` Lossy compression.
WebP	ImageMagick (WebAssembly)	Lossy	in browser Lossy compression.

Sources

From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), WebAssembly engines (ImageMagick, FFmpeg, Pandoc, 7-Zip, GDAL, Assimp, resvg), Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-26.

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