From 40e5a5811c6ffce9b0974e93cdd927cbcf60c157 Mon Sep 17 00:00:00 2001 From: Joe Hunkeler Date: Tue, 11 Aug 2015 16:51:37 -0400 Subject: Repatch (from linux) of OSX IRAF --- noao/imred/generic/doc/normflat.hlp | 54 +++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 noao/imred/generic/doc/normflat.hlp (limited to 'noao/imred/generic/doc/normflat.hlp') diff --git a/noao/imred/generic/doc/normflat.hlp b/noao/imred/generic/doc/normflat.hlp new file mode 100644 index 00000000..3020d296 --- /dev/null +++ b/noao/imred/generic/doc/normflat.hlp @@ -0,0 +1,54 @@ +.help normflat Sep84 noao.imred.generic +.ih +NAME +normflat -- Create a flat field by normalizing a calibration image +.ih +USAGE +normflat image flatfield +.ih +PARAMETERS +.ls image +Calibration image to be used. +.le +.ls flatfield +Flat field to be created. +.le +.ls norm = INDEF +Normalization factor to be used if not INDEF. If INDEF the normalization +factor is automatically determined. +.le +.ls minflat = INDEF +Minimum data value to be used in determining the normalization and in +creating the flat field. Values less than or equal to this value are +replaced with a flat field value of 1. +.le +.ls sample_section = "[]" +Section of the image to be sampled in determining the normalization if +norm = INDEF. +.le +.ih +DESCRIPTION +A flat field is created from a calibration image by normalizing the calibration +image. The normalization is specified with the parameter \fInorm\fR. If the +value of \fInorm\fR is INDEF then the normalization is determined by sampling +the pixels in the sample section with values greater than \fIminflat\fR. +This task differs from the task \fBnormalize\fR in that data values less +than or equal to \fIminflat\fR are replaced with unity in the normalized +flat field. +.ih +EXAMPLES +To create a flat field from a calibration image "quartz" using pixels +above 1000 and selecting the normalization to be 3500: + + cl> normflat quartz flat norm=3500 minflat=1000 + +To determine a normalization from the pixels above 1000 and sampling +every fifth pixel in each dimension: + +.nf + cl> normflat quartz flat minflat=1000 sample=[*:5,*:5] +.fi +.ih +SEE ALSO +normalize +.endhelp -- cgit