FITS2NDF Parameter FMTCNV has a new allowed value of "Native" requesting that there is no format conversion, and the array of numbers stored in the FITS file are copied to a scaled array within the NDF. This preserves the data compression. Parameter TYPE continues to control the data type of the true unscaled values.
NDF2FITS Parameter BITPIX has a new allowed value
of "Native". This requests that should any scaled-form arrays be
converted, then the data type of the corresponding output FITS array
is set to the scaled-form array's data type, and that the scale and
offset coefficients for the format conversion are taken from the NDF's
scaled array too. This new facility preserves the data compression
of large files. In the absence of a scaled array, the application
behaves as if BITPIX=-1 were specified.
CONVERT A Format-conversion Package