mBgExec(1) Run mBackground on all the images in a metadata table


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


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


-p projdir
Specifies the path to the directory containing the projected images.
-s statusfile
Writes output message to statusfile instead of to stdout
Turns on debugging
Indicates that no area images are present (assumes equal weighting for each pixel)


Image metadata table generated by mImgtbl.
Table of corrections generated by mFitExec
Directory where output images should be written


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


[struct stat="OK", count=num-images, nocorrection=num-skipped, failed=num-failed]
MPI initialization failed
Cannot open status file: statusfile
Cannot access corrdir
corrdir is not a directory
Invalid image metadata file: images.tbl
Need columns: cntr and fname in image list
Too many entries in image list for compiled program
mBackground error


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.


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.