NAME

       fulla - Correct lens distortion, vignetting and chromatic aberration

SYNOPSIS

       fulla [options] inputfile(s)

DESCRIPTION

       Apply radial or flat-field vignetting correction as well as geometrical radial distortion
       and transversal chromatic aberration correction.

       fulla can be used to batch correct a large number of files. Radial distortion coefficients
       can be read from a lens database.

       Vignetting correction is done the same way as described in the nona script file
       documentation, or from lens database.  Vignetting correction can be done based on a flat-
       field or a radial scaling.

       Vignetting correction by flat-field division:
                               I = I / c,    c = flat-field / mean(flat-field)

       Radial vignetting correction:
                               I = I / c,    c = a + b*r^2 + c*r^4 + d*r^6

       The radial distortion correction is identical to the one implemented by PanoTools:

       r_new = a*r^4 + b*r^3 + c*r^2 + d*r   [1]

       Since transversal chromatic aberrations (TCA) leads to differently scaled objects in the
       red, green and blue channel, it can be corrected by scaling the red and blue channel so
       that they match the green channel. Most applications, like Photoshop or Picture Window Pro
       offer TCA correction by linear scaling. This is equal to varying the d parameter in
       equation [1].

       See http://hugin.sf.net/tutorials/tca for a method to determine these parameters.

OPTIONS

       --green=db|a:b:c:d
           Correct radial distortion coefficient for all channels, (a, b, c, d) Specify 'db' for
           database lookup or the 4 coefficients a:b:c:d

       --blue=db|a:b:c:d
           Correct radial distortion coefficients for blue channel, (a, b, c, d). This is applied
           on top of the --green distortion coefficients, use for TCA corr Specify 'db' for
           database lookup or the 4 coefficients a:b:c:d

       --red=db|a:b:c:d
           Correct radial distortion coefficients for red channel, (a, b, c, d). This is applied
           on top of the --green distortion coefficients, use for TCA corr Specify 'db' for
           database lookup or the 4 coefficients a:b:c:d

       --camera-maker=Maker
           Camera manufacturer, for database query

       --camera-model=Cam
           Camera name, for database query

       --lensname=Lens
           Lens name, for database query

               Specify --camera-maker and --camera-model for fixed lens cameras or --lensname for
               interchangeable lenses.

       --focallength=50
           Specify focal length in mm, for database query

       --aperature=3.5
           Specify aperture for vignetting data database query

       --dont-rescale
           Do not rescale the image to avoid black borders.

       --flatfield=filename
           Vignetting correction by flatfield division I = I / c, c = flatfield / mean(flatfield)

       --vignetting=db|a:b:c:d
           Correct vignetting (by division) Specify db for database look up or the the 4
           coefficients a:b:c:d I = I / ( a + b*r^2 + c*r^4 + d*r^6)

       --linear
           Do vignetting correction in linear color space

       --gamma=value
           Gamma of input data.  Used for gamma correction before and after flatfield correction

       threads=n
           Number of threads that should be used

       -h|--help
           Display help

       --output=name
           Set output filename. If more than one image is given, the name will be used as suffix.
           (default suffix: _corr)

       --compression=value
           Compression of the output files.  For jpeg output: 0-100 For tiff output: PACKBITS,
           DEFLATE, LZW

       --offset=X:Y
           Horizontal and vertical shift

       --verbose
           Verbose

AUTHORS

       Written by Pablo d'Angelo. Also contains contributions from Douglas Wilkins, Ippei Ukai,
       Ed Halley, Bruno Postle, Gerry Patterson, Brent Townshend and Thomas Modes.

"Version: 2021.0.0"                         2021-10-23                                   FULLA(1)