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fpack - FITS image compression and decompression utilities
- Description:
fpack optimally compresses FITS format images and funpack restores
them to the original state.
* Integer format images are losslessly compressed using the Rice
compression algorithm.
- typically 30% better compression than GZIP
- about 3 times faster compression speed than GZIP
- about the same uncompression speed as GUNZIP
* Floating-point format images are compressed with a lossy algorithm
- truncates the image pixel noise by a user-specified amount to
produce much higher compression than by lossless techniques
- the precision of scientific measurements in the compressed image
(relative to those in the original image) depends on the
selected amount of compression
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