# IMCOMBINE -- Image combine parameters

input,s,a,,,,List of images to combine
output,s,a,,,,List of output images
headers,s,h,"",,,List of header files (optional)
bpmasks,s,h,"",,,List of bad pixel masks (optional)
rejmasks,s,h,"",,,List of rejection masks (optional)
nrejmasks,s,h,"",,,List of number rejected masks (optional)
expmasks,s,h,"",,,List of exposure masks (optional)
sigmas,s,h,"",,,List of sigma images (optional)
imcmb,s,h,"$I",,,Keyword for IMCMB keywords
logfile,s,h,"STDOUT",,,"Log file
"
combine,s,h,"average","average|median|lmedian|sum|quadrature|nmodel",,Type of combine operation
reject,s,h,"none","none|minmax|ccdclip|crreject|sigclip|avsigclip|pclip",,Type of rejection
project,b,h,no,,,Project highest dimension of input images?
outtype,s,h,"real","short|ushort|integer|long|real|double",,Output image pixel datatype
outlimits,s,h,"",,,Output limits (x1 x2 y1 y2 ...)
offsets,f,h,"none",,,Input image offsets
masktype,s,h,"none","",,Mask type
maskvalue,s,h,"0",,,Mask value
blank,r,h,0.,,,"Value if there are no pixels
"
scale,s,h,"none",,,Image scaling
zero,s,h,"none",,,Image zero point offset
weight,s,h,"none",,,Image weights
statsec,s,h,"",,,Image section for computing statistics
expname,s,h,"",,,"Image header exposure time keyword
"
lthreshold,r,h,INDEF,,,Lower threshold
hthreshold,r,h,INDEF,,,Upper threshold
nlow,i,h,1,0,,minmax: Number of low pixels to reject
nhigh,i,h,1,0,,minmax: Number of high pixels to reject
nkeep,i,h,1,,,Minimum to keep (pos) or maximum to reject (neg)
mclip,b,h,yes,,,Use median in sigma clipping algorithms?
lsigma,r,h,3.,0.,,Lower sigma clipping factor
hsigma,r,h,3.,0.,,Upper sigma clipping factor
rdnoise,s,h,"0.",,,ccdclip: CCD readout noise (electrons)
gain,s,h,"1.",,,ccdclip: CCD gain (electrons/DN)
snoise,s,h,"0.",,,ccdclip: Sensitivity noise (fraction)
sigscale,r,h,0.1,0.,,Tolerance for sigma clipping scaling corrections
pclip,r,h,-0.5,,,pclip: Percentile clipping parameter
grow,r,h,0.,0.,,Radius (pixels) for neighbor rejection