flipx(1) General Commands Manual flipx(1)NAME
flipx - Flip x axis in a FITS image
SYNOPSIS
flipx <input images>
DESCRIPTION
This is an example use of the qfits library. This program expects a list of FITS file names in input. For each input file, it will flip the
image contained in the main data section in the X direction, i.e. pixel (i,j) is swapped with pixel (lx-i, j).
The pixel loading mechanism is independent from endian-ness of the local host or FITS pixel type. This program offers a good overview of
how to use qfits for pixel-level operations.
OPTIONS
None.
FILES
Input files shall all comply with FITS format.
BUGS
Notice that this program does not support cubes or image extensions, but could be easily extended to support that case.
25 Jul 2001 flipx(1)
Check Out this Related Man Page
iofits(1) General Commands Manual iofits(1)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 :
o 8 bits per pixel, unsigned.
o 16 bits per pixel, signed
o 32 bits per pixel, signed
o -32 IEEE floating point
o -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 swap-
ping 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!
25 Feb 1997 iofits(1)
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