This package uses public domain ImageJ java classes for importing grayscale TIFF files and stacks and writing 8 and 16 bit integer and 32 bit floating point TIFF files
Mathematica J/Link is used to access java classes of the ImageJ image processing library. ImageJ is maintained by Wayne Rasband at NIH and is available for free at http://rsb.info.nih.gov/ij/download.html