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

       images.tbl
              Image metadata table generated by mImgtbl.

       corrections.tbl
              Table of corrections generated by mFitExec

       corrdir
              Directory where output images should be written

       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.

       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.

Montage 5                                           Dec 2016                                          MBGEXEC(1)

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

       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.

       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  mBackgrounderror

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

       -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)

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

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