HDR files pack 32-bit floating-point light data — every stop from pitch black to blown highlights simultaneously. JPG can't hold all of that. Tone-mapping chooses what to show; this converter does it in your browser.
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Supports HDR
Supports HDR
Drop Radiance RGBE (.hdr) files from 3D rendering software, HDRI Haven, or HDR panorama capture. Files from Cinema 4D, Blender, Maya HDRI exports all work.
Floating-point luminance values map to 8-bit JPG range using Reinhard tone-map operator — a perceptually balanced algorithm preserving detail in both shadows and highlights.
Output is a viewable 8-bit JPG. All visual detail is compressed into sRGB range. Keep the original .hdr for production use; this JPG is for preview and sharing.
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Radiance RGBE image format
Joint Photographic Experts Group JFIF format
Note, JPG is a lossy compression. In addition, you cannot create black and white images with JPG nor can you save transparency. Requires jpegsrc.v8c.tar.gz. You can set quality scaling for luminance and chrominance separately (e.g. -quality 90,70). You can optionally define the DCT method, for example to specify the float method, use -define jpeg:dct-method=float. By default we compute optimal Huffman coding tables. Specify -define jpeg:optimize-coding=false to use the default Huffman tables. Two other options include -define jpeg:block-smoothing and -define jpeg:fancy-upsampling. Set the sampling factor with -define jpeg:sampling-factor. You can size the image with jpeg:size, for example -define jpeg:size=128x128. To restrict the maximum file size, use jpeg:extent, for example -define jpeg:extent=400KB. To define one or more custom quantization tables, use -define jpeg:q-table=filename. These values are multiplied by -quality argument divided by 100.0. To avoid reading a particular associated image profile, use -define profile:skip=name (e.g. profile:skip=ICC).
Tone-mapping algorithms, quality, and HDR preservation.
