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.help crcombine Apr98 noao.imred.crutil
.ih
NAME
crcombine -- combine multiple exposures to eliminate cosmic rays
.ih
USAGE
.nf
crcombine input output
.fi
.ih
PARAMETERS
See parameters for \fBimcombine\fR.
.ih
DESCRIPTION
This task is a version of \fBimcombine\fR. See the help for that task
for a description of the parameters and algorithms.
For the purpose of removing cosmic rays the most useful options
are the "crreject" algorithm and/or combining with a median. Many other
options may work as well. The best use of this task depends on the
number of images available. If there are more than a few images the
images should be combined with an "average" and using a rejection
algorithm.
.ih
EXAMPLES
1. To combine two images using the gain and read noise parameters in
the image header:
.nf
cl> crcombine obj012,obj013 abc gain=gain rdnoise=rdnoise
.fi
.ih
SEE ALSO
imcombine
.endhelp
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