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diff --git a/noao/imred/ccdred/ccdtest/subsection.hlp b/noao/imred/ccdred/ccdtest/subsection.hlp new file mode 100644 index 00000000..a2779500 --- /dev/null +++ b/noao/imred/ccdred/ccdtest/subsection.hlp @@ -0,0 +1,73 @@ +.help subsection Oct87 noao.imred.ccdred.ccdtest +.ih +NAME +subsection -- Make a subsection readout CCD image +.ih +USAGE +subsection subimage image +.ih +PARAMETERS +.ls subimage +Subsection image to be created. +.le +.ls image +Full image from which to take the subsection readout. +.le +.ls ncols = 82, nlines = 50 +Number of image columns and lines in the full subsection image including +bias regions. +.le +.ls ccdsec="[26:75,26:75]" +CCD section of the subsection. This is the image section of the full +image to be used. +.le +.ls datasec = "[1:50,1:50]" +Data section of the image. +.le +.ls trimsec = "" +Trim section for later processing. +.le +.ls biassec="[51:82,1:50]" +Prescan or overscan bias section. +.le +.ls overwrite = no +Overwrite an existing image? If no a new observation is not created. +There is no warning message. +.le +.ih +DESCRIPTION +This script task generates artificial CCD subsection observations +which include bad pixels, bias and zero levels, dark counts, flat +field response variations and sky brightness levels. It creates an +subsection image which includes a bias section from a previously +created image (created by the task \fBartobs\fR). This task is +designed to be used with the \fBccdred\fR package and includes +appropriate image header information. + +First the task checks whether the requested image exists. If it does +exist and the overwrite flag is no then a new observations is not created. +If the overwrite flag is set then the old image is deleted and a new +observation is created. + +The image section give by the parameter \fIccdsec\fR of the reference +image is copied to the new image. It is assumed the reference image +contains any desired zero level, bias, flat field, and dark count +effects. The bias section is then added with a bias value given by +\fBartobs.biasval\fR with noise given by \fBartobs.sigma\fR. + +Also the image header parameters from the reference image are +copied and the data, bias, trim, and ccd section parameters are +updated. +.ih +EXAMPLES +1. To create some test CCD images first create full frame observations with +the task \fBartobs\fR. Then set the subsection parameters +for the size of the subsection observation, the data section, trim section, +bias section, and the CCD section of the subsection observation. + + cl> artobs obj 5 object filter=V + cl> subsection obj1 object +.ih +SEE ALSO +mkimage, artobs, demo +.endhelp |