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From Odwiki

HDRI stands for High Dynamic Range Imaging.

HDRI describes storing image data which is not clamped or limited to the 0 to 1 range. This is mostly applicable to storing photographs captured at various exposures which are then linearized and combined to produce an image with more accurately captures the incident light energy in the scene. These images are generally captured by photographing in all directions and at many (bracketed) exposures.

There are several image FileFormats supported in Houdini capable of storing HDR data:

• exr - OpenEXR format
• tif - 32bit IEEE floating point TIFF
• pic and rat - Houdini's native formats
• hdr - Radiance's hdr file format - which also implies a CrossImage - via isixpack. For further infomation, see http://www.anyhere.com/gward/hdrenc/hdr_encodings.html

Example light probes that can be converted into rat for use in Houdini (eg. VEX Global Illumination SHOP) can be found here: http://www.debevec.org/Probes/

Tools for manipulating HDRI

• HDRShop
• CinePaint
• Nuke
• Houdini Compositing