_update_header_data(self, image_header, name=None, compression_type=None, tile_size=None, hcomp_scale=None, hcomp_smooth=None, quantize_level=None, quantize_method=None, dither_seed=None)
This method is mainly called internally, but a user may wish to call this method after assigning new data to the CompImageHDU
object that is of a different type.
header to be associated with the image
the EXTNAME
value; if this value is :None:None:`None`, then the name from the input image header will be used; if there is no name in the input image header then the default name 'COMPRESSED_IMAGE' is used
compression algorithm 'RICE_1', 'PLIO_1', 'GZIP_1', 'GZIP_2', 'HCOMPRESS_1'; if this value is :None:None:`None`, use value already in the header; if no value already in the header, use 'RICE_1'
compression tile sizes as a list; if this value is :None:None:`None`, use value already in the header; if no value already in the header, treat each row of image as a tile
HCOMPRESS scale parameter; if this value is :None:None:`None`, use the value already in the header; if no value already in the header, use 1
HCOMPRESS smooth parameter; if this value is :None:None:`None`, use the value already in the header; if no value already in the header, use 0
floating point quantization level; if this value is :None:None:`None`, use the value already in the header; if no value already in header, use 16
floating point quantization dithering method; can be either NO_DITHER (-1), SUBTRACTIVE_DITHER_1 (1; default), or SUBTRACTIVE_DITHER_2 (2)
random seed to use for dithering; can be either an integer in the range 1 to 1000 (inclusive), DITHER_SEED_CLOCK (0; default), or DITHER_SEED_CHECKSUM (-1)
Update the table header (:None:None:`_header`) to the compressed image format and to match the input data (if any). Create the image header (:None:None:`_image_header`) from the input image header (if any) and ensure it matches the input data. Create the initially-empty table data array to hold the compressed data.
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