NAME
flip - flips image files about rows or columns
SYNOPSIS
flip file rows | cols [outfile=]
DESCRIPTION
flip generates the mirror image of a FITS file.
If the rows option is
specified the program places the mirror on the central row of the image. If
the cols options is specified, a given pixels row will not change, but
the column will be reflected. Note: this is not the same as an image
rotation.
Use this command to change the handedness of an image so that it matches the
way it is viewed on the sky or on a finding chart, or to get the wavelength
dispersion of a spectrum running the desired
way.
The data overwrites the input file unless the outfile option is
used.
flip is faster in cols than in rows.