hrepack(1) copies an HDF file to a new file

SYNOPSIS

hrepack -i input -o output [-V] [-h] [-v] [-t comp_info] [-c chunk_info] [-f cfile] [-m size]

DESCRIPTION

hrepack copies an HDF file to a new file with/without compression and/or chunking.

OPTIONS

-i input
input HDF File
-o output
output HDF File
-V
prints version of the HDF4 library and exits
-h
prints usage information
-v
verbose mode
-t comp_info
compression type: 'comp_info' is a string with the format <object list>:<type of compression><parameters>

<object list> is a comma separated list of object names meaning apply compression only to those objects. '*' means all objects.

<type of compression> can be:

RLE

for RLE compression

HUFF

for Huffman

GZIP

for gzip

JPEG

for JPEG (for images only)

SZIP

for szip

NONE

to uncompress

<parameters> is optional compression info

RLE

no parameter

HUFF

the skip-size

GZIP

the deflation level

JPEG

the quality factor

SZIP

pixels per block, compression mode (NN or EC)

-c chunk_info
apply chunking. chunk_info is a string with the format <object list>:<chunk information>

<object list> is a comma separated list of object names meaning apply chunking only to those objects. '*' means all objects

<chunk information> is the chunk size of each dimension: dim_1 x dim_2 x ... dim_n or NONE, to unchunk a previous chunked object

-f cfile
file with compression information -t and -c
-m size
do not compress objects smaller than size (bytes)

EXAMPLES

compresses all objects in the file file1.hdf, using RLE compression

hrepack -v -i file1.hdf -o file2.hdf -t '*:RLE'
      

applies Skipping Huffman compression with skip factor of 1, for objects /group1/A, /group2/B and C

hrepack -v -i file1.hdf -o file2.hdf -t '/group1/A,/group2/B,C:HUFF 1'
      

applies RLE compression for object /group1/D.

applies chunking to objects D and E using a chunk size of 10 for the 2 dimensions

hrepack -v -i file1.hdf -o file2.hdf -t '/group1/D:RLE' -c 'D,E:10x10'
      

uncompresses object A

hrepack -v -i file1.hdf -o file2.hdf -t 'A:NONE'
      

applies SZIP compression to object A, with parameters 8 and NN

hrepack -v -i file1.hdf -o file2.hdf -t 'A:SZIP 8,NN'
      

Note: the use of the verbose option -v is recommended