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Radiance HDR (.hdr)

Radiance HDR, also known as RGBE or Radiance Picture is a lossless raster image format invented by Gregory Ward Larson. Like OpenEXR, it supports high-dynamic-range imaging. Radiance HDR files store colors in 8 bits per component, but with an additional byte for shared exponent.
Each Radiance HDR file contains all the data from all the pictures; so a wide luminance range is present, from bright, white highlights to the darkest black.

HDR Specifications

Name Radiance HDR
File Extension(s) .hdr
Category Raster Images
Use For Satellite imagery, physically based rendering, scientific and medical visualization, high-dynamic-range image processing, and digital photography.
Developer Gregory Ward Larson and Randolph Fritz
MIME Type(s) image/vnd.radiance
License Open-source software (Radiance)
File Sample(s) N/A
Compression RLE (Run Length Encoding)
Max Dimensions N/A
Color Modes
Mode Bits Description
True color with shared exponent 8 Radiance Picture uses 8-bit RGBE color, with each component taking 8 bits for a total of 32 bits per pixel.
Animation No
Transparency No
Interlacing No
Metadata No
Layers N/A
Multipage No