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PyNOT : imflat
The imflat
task takes a list of a flat images and combines them into a master combined flat frame.
The command line task accepts wildcards, an explicit list of files, or a file containing a
list of files. The combination is performed using a sigma-clipped mean or median.
The threshold of the clipping and the method can be controlled by the kappa
and method
arguments. Each individual flat frame is normalized by its median value.
pynot imflat
is to source it from the file
classification table for each photometric filter:
%] cat dataset.pfc | grep IMG_FLAT | grep SDSS_r > flat_r.list
%] pynot imflat flat_r.list --output master_flat_r.fits --method median
Alternatively the input can be passed as an explicit list:
%] pynot imflat data/flat1.fits data/flat2.fits data/flat3.fits --output master_flat.fits
or using wildcards:%] pynot imflat data/flat*.fits --output master_flat.fits
Overview of parameters
- input
- List of flat images to combine (command line accepts a list of files and wildcards)
- bias: 0
- Filename of the combined bias frame. (If no file is given, a value of 0 is assumed)
- method: median
- Method for image combination (options: median/mean)
- kappa: 15
- Threshold for sigma clipping in bias combiniation
Example Syntax
pynot imflat --bias BIAS -o OUTPUT input
Full example of command line syntax:
pynot imflat [-h] --bias BIAS -o OUTPUT [--kappa KAPPA] [--method {mean,median}] input
Overview of parameters
- input
- Input file containing list of image filenames to combine
- --bias
- Filename of combined bias frame [REQUIRED]
- --output (-o)
- Output filename of combined bias frame [REQUIRED]
- --kappa: 15
- Threshold for sigma clipping
- --method: 'mean'
- Method for image combination