NAME

       mBgExec - Run mBackground on all the images in a metadata table

SYNOPSIS

       mBgExec [-p projdir] [-s statusfile] [-d] [-n(o-areas)] images.tbl corrections.tbl corrdir

DESCRIPTION

       Runs mBackground on all the images in a metadata table, using the corrections generated by
       mFitExec.

OPTIONS

       -p projdir
              Specifies the path to the directory containing the projected images.

       -s statusfile
              Writes output message to statusfile instead of to stdout

       -d     Turns on debugging

       -n     Indicates that no area images are present (assumes equal weighting for each pixel)

ARGUMENTS

       images.tbl
              Image metadata table generated by mImgtbl.

       corrections.tbl
              Table of corrections generated by mFitExec

       corrdir
              Directory where output images should be written

RESULT

       Output FITS images will be created in the directory specified by corrdir, with names  that
       are the same as the uncorrected images.

MESSAGES

       OK     [struct stat="OK", count=num-images, nocorrection=num-skipped, failed=num-failed]

       ERROR  MPI initialization failed

       ERROR  Cannot open status file: statusfile

       ERROR  Cannot access corrdir

       ERROR  corrdir is not a directory

       ERROR  Invalid image metadata file: images.tbl

       ERROR  Need columns: cntr and fname in image list

       ERROR  Too many entries in image list for compiled program

       ERROR  mBackground error

EXAMPLES

       In  this  example, images.tbl describes the unprojected or projected images (filenames are
       the same if mProjExec was used), and corrections.tbl was generated  using  mBgModel  after
       running mDiffExec and mFitExec on those images.

       $ mBgExec -p proj images.tbl corrections.tbl corr
              [struct stat="OK", count=16, failed=0]

       corr now contains the images with background removal applied.

BUGS

       The drizzle algorithm has been implemented but has not been tested in this release.

       If  a  header  template  contains  carriage  returns  (i.e., created/modified on a Windows
       machine), the cfitsio library will be unable to read it properly, resulting in the  error:
       [struct stat="ERROR", status=207, msg="illegal character in keyword"]

       It  is  best  for the background correction algorithms if the area described in the header
       template completely encloses all of the input images in their entirety. If parts of  input
       images  are  "chopped  off"  by  the  header  template,  the background correction will be
       affected. We recommend you use an expanded header  for  the  reprojection  and  background
       modeling  steps, returning to the originally desired header size for the final coaddition.
       The default background matching assumes that there are no non-linear background variations
       in  the  individual  images  (and  therefore  in the overlap differences). If there is any
       uncertainty in this regard, it is safer to turn on the "level  only"  background  matching
       (the "-l" flag in mBgModel.

COPYRIGHT

       2001-2015 California Institute of Technology, Pasadena, California

       If  your  research  uses  Montage,  please  include  the  following acknowledgement: "This
       research made use of Montage. It is funded by the National Science Foundation under  Grant
       Number  ACI-1440620,  and  was  previously  funded  by  the National Aeronautics and Space
       Administration's Earth Science Technology Office, Computation Technologies Project,  under
       Cooperative  Agreement  Number  NCC5-626  between  NASA  and  the  California Institute of
       Technology."

       The Montage distribution includes an adaptation of the MOPEX algorithm  developed  at  the
       Spitzer Science Center.