This is the command mDiff that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
mDiff - Calculates the difference between a pair of overlapping images
mDiff [-d level] [-n(o-areas)] [-s statusfile] in1.fits in2.fits out.fits template.hdr
mDiff calculates a simple difference between a single pair of overlapping images. This is
meant for use on reprojected images where the pixels already line up exactly. mDiff
analyzes an image metadata table to determine a list of overlapping images. Each image is
compared with every other image to determine all overlapping image pairs. A pair of
images are deemed to overlap if any pixel around the perimeter of one image falls within
the boundary of the other image.
Turns on debugging to the specified level (1-4).
-n No-area-images flag. Creates difference image without requiring pixel area FITS
Output and errors are sent to statusfile instead of to stdout
First input FITS file. (Also needs area image in1_area.fits, or use -n flag)
Second input FITS file.(Also needs area image in2_area.fits, or use -n flag)
Difference FITS image to be generated.
FITS header template used to generate output image.
FITS image and area image representing the difference in the overlap region.
OK [struct stat="OK"]
ERROR Cannot open status file: statusfile
ERROR Images don't overlap
ERROR All pixels are blank
ERROR Template file not found
ERROR FITS library error
ERROR general error
$ mDiff proj/in1.fits proj/in2.fits output/diff.fits template.hdr
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