compress_image_data#

astropy.io.fits.hdu.compressed._tiled_compression.compress_image_data(image_data, compression_type, compressed_header, compressed_coldefs)[source]#

Compress the data in a CompImageHDU.

The input HDU is expected to have a uncompressed numpy array as it’s .data attribute.

Parameters:

image_datandarray: The image data to compress
compression_typestr: The compression algorithm
compressed_headerHeader: The header of the compressed binary table
compressed_coldefsColDefs: The ColDefs object for the compressed binary table

Returns:

nbytesint: The number of bytes of the heap.
heapbytes: The bytes of the FITS table heap.