The XRH file format (with .xrh file name extension) is a simple standard royalties-free file format for storing and archiving extended range raster image data.
XRH stores higher precision extended range still images. The images could be any spatially correlated rectangular raster data, such as photographs, or geographic elevation data, etc. Each image contains one or more channels (also called image planes or components).
Extended range (XR) images are images that store more than 8 bits per channel. Legacy extended range formats primarily store images that are 16 or 24 bits per channel. XRH files store images that are 32 bits or 64 bits per channel.
Each value (sample) stored in a channel in an XRH file is a floating point number (FLOAT32 or FLOAT64).
In an XRH file, each channel of floating point numbers is stored compressed. The following compression formats are supported for each channel in this version of the XRH file format specification:
Zebra is a lossless compression method using ZST o to store Byte Channels of the 32-bit (or 64-bit) floating point samples, four (or eight) Byte Channels per image channel.
SZ 2.1.9 is a high quality lossy compression method that is under active development:
Additional compression methods may be added in the future. More information about this file format will be posted.
Free proof-of-concept C source code for reading and writing XRH files is provided in XRHLIB o
The XRH file format is for use royalties-free, including in commercial applications. Disclaimer: No warranties expressed or implied are provided; In no event will this specification’s authors, publishers or anyone associated thereof be held liable for any damages arising from its use.
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