#acl VadimBurwitz:read,write,delete,revert,admin SherrySuyu:read,write,delete,revert AlejandraMelo:read,write,delete,revert AdamKinasz:read,write,delete,revert WienczyslawBykowski:read,write,delete,revert PiotrSybilski:read,write,delete,revert All:read
 * [[http://fitsh.szofi.net/|Fitsh homepage]]

= Basic detrending =

 * Use [[http://fitsh.szofi.net/task/ficalib|ficalib]] and [[http://fitsh.szofi.net/task/ficombine|ficombine]] to detrend the images
 * For now just throw away the overscan (-> trim the image to 0..4095;0..4095)

== Master bias ==

{{{
ficalib --rewrite-output-name '.fits|_proc.fits' --trim 0:0:4095:4095 -i bias*.fits
ficombine --mode median -o master_bias.fits bias*_proc.fits
}}}

== Master Dark ==

Use largest exposure time for master dark

{{{
ficalib --rewrite-output-name '.fits|_proc.fits' --input-master-bias master_bias.fits --trim 0:0:4095:4095 -i dark_300s_*.fits
ficombine --mode median -o master_dark.fits dark_30s*_proc.fits
}}}

== Flats ==

 * Rescale dark (exptime-correction)
 * Scale images to common level (post-scale 30000)
 * Stack images with reject-median (to get rid of stars in the images IF offsetting between images was done)

{{{
ficalib --rewrite-output-name '.fits|_proc.fits' --input-master-bias master_bias.fits --input-master-dark master_dark.fits --exptime-correction --post-scale 30000 --trim 0:0:4095:4095 -i flat_R_*.fits
ficombine --mode rejmed -o master_flat_R.fits flat_R_*_proc.fits
}}}

== Objects ==

 * Subtract rescaled dark (exptime-correction)

{{{
ficalib --rewrite-output-name '.fits|_proc.fits' --input-master-bias master_bias.fits --input-master-dark master_dark.fits --input-master-flat master_flat_R.fits --exptime-correction  --trim 0:0:4095:4095 -i obj_R_*.fits
}}}

 * Now either run sextractor directly on image or try with grmatch+fitrans+ficombine to stack (see [[http://fitsh.szofi.net/example/m74|here]] how to the alignment of the images)