This is the command hdf24to8 that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
hdf24to8 - convert an 24-bit image in an HDF file to a 8-bit image in another HDF file
hdf24to8 input_hdf_file output_hdf_file
hdf24to8 converts a 24-bit image in an HDF file into an 8-bit image in an other HDF file.
Use hdf24to8 online using onworks.net services