compress_hdu¶
- astropy.io.fits._tiled_compression.compress_hdu(hdu)[source]¶
Compress the data in a
CompImageHDU
.The input HDU is expected to have a uncompressed numpy array as it’s
.data
attribute.- Parameters:
- hdu
astropy.io.fits.CompImageHDU
Input HDU to compress the data for.
- hdu
- Returns:
- nbytes
int
The number of bytes of the heap.
- heap
bytes
The bytes of the FITS table heap.
- nbytes