biasredux -- compute initial standard CCD-reduction and creates an error-frame
biasredux [flags] images
| gain || g || 1.0 |
| lower || l || 0.0 |
| mask || m || |
| masterbias || b || |
| mbiasnan || n || -1e10 |
| reg || r || 0:0,0:0 |
| satur || s || 61000.0,1 |
| shutter || h || |
| tresh || t || 54000.0 |
- gain = 1.0
- Conversion factor: # photons = gain * ADU
- lower = 0.0
- Lower threshold [ADU]: all Pixels below this value are set to "0".
- If a bad-pixel-mask is specified, all pixels with value "0" in the mask are set to value "0" in the images.
- If a masterbias is specified, it is subtracted pixels by pixel.
- mbiasnan = -1e10
- Nan value in masterbias.
- reg = 0:0,0:0
- Overscan region: x1:x2,y1:y2
- satur = 61000.0,1
- Saturation threshold [ADU]: all Pixels above this value are set to "0". The second number specifies a radius for masking
neighbouring pixels (blooming correction).
- Filename of shutter correction file.
- thresh = 54000.0
- Linearity threshold [ADU]: all Pixels above this values are set to the value "0".
- Images to be processed.
The task biasredux is doing the initial CCD-reduction. First, bad pixels (mask-flag), nonlinear pixels (thresh-flag) and
saturated pixels as well as their neigbouring ones (satur-flag) are masked (set to the value "0"). After that a bias correction is made. For
this step a either a masterbias image (masterbias-flag) or an overscan region (reg-flag) has to be specified. Using the -h flag,
biasredux is doing a shutter correction. The given file must be in FITS-format. For each image biasredux will create an errorframe based on photon
- bias reduced and masked image
- errorframe of bias reduced and masked image
biasredux -g 3.35 -m Mask_WST.fits -h sdyshutter_WST.fits -r 150:950,2:14 -s 65000,2 -t 64000 F1_r_*.fits
This task was implemented by A. Riffeser
Dokumentation maintained by J. Koppenhöfer
This file was last time updated on 21 Feb 2005