Since it was the first (and for a long time the only) HDR image format, this format is supported by many other software packages.

The file starts with the signature '#?RADIANCE' and then several lines listing the commands used to generate the image. This information allows the renderer rpict to continue a partially completed render (either manually, or using the rad front-end). There are also key=value declarations, including the line 'FORMAT=32-bit_rle_rgbe'.

After this is a blank line signifying the end of the

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