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Nrrd ("nearly raw raster data") is a library and file format for the representation and processing of n-dimensional raster data. It was developed by Gordon Kindlmann to support scientific visualization and image processing applications.
Utah Nrrd Utilities
The command-line toolunu (Utah Nrrd Utilities) is used for the manipulation and management of nrrd files.
^ Aja-Fernández, Santiago; de Luis Garcia, Rodrigo; Tao, Dacheng; Li, Xuelong (2009). Tensors in Image Processing and Computer Vision. Advances in Computer Vision and Pattern Recognition. Springer Science & Business Media. ISBN9781848822993.