NAME¶
iofits - FITS data format conversion (pixel depth)
SYNOPSIS¶
iofits [options] <in_fits> <out_fits> <depth>
DESCRIPTION¶
iofits converts FITS files of any pixel depth to another pixel depth (bits per
pixel). Depth is given as in the FITS norm :
- •
- 8 bits per pixel, unsigned.
- •
- 16 bits per pixel, signed
- •
- 32 bits per pixel, signed
- •
- -32 IEEE floating point
- •
- -64 IEEE double precision floating point
OPTIONS¶
- -v
- Verbose mode.
- -M megs
- Memory handling. To avoid saturate memory for huge cubes,
this parameter specifies the maximum amount of memory to use before
swapping data to disk. The amount is given in Megabytes. (1Meg = 1,048,576
Bytes) The process time is then considerably slowed down. Default value is
50 megs.
FILES¶
Input/output files shall all comply with FITS format.
The original FITS header of the input FITS file is conserved along, except for
the following keywords: NAXIS, NAXISn, BITPIX, BSCALE, BZERO, which are
related to the newly created file.
HISTORY keywords are appended to the FITS header to indicate the eclipse process
modifications, together with the command line which was used to generate the
file.
SEE ALSO¶
average, filt, deadpix
BUGS¶
In general, decreasing the resolution in number of bits per pixel almost always
means loss of precision. No rescaling is done on the data, use this command
with care!