Fulla

fulla is a command-line tool distributed with hugin. It can correct chromatic aberration, lens distortion, and vignetting.

About fulla

fulla is suitable for batch correction of:

Chromatic aberration

See tutorial in external links.

Lens distortion

Barrel or pincushion distortion can be corrected using the same a, b, c and d parameters as other Panorama Tools derived programs.

Vignetting

Polynomial correction by division, addition or flatfield images. hugin contains a vignetting calculator that can use a series of overlapping photographs to determine the likely polynomial required to correct common vignetting problems.

fulla can work with the same range of image types as nona, including 8bit and 16bit TIFF and 32bit floating-point HDR TIFF data.

Command-line usage

 Usage: fulla [options] inputfile(s)
  option are:
     --green=db|a:b:c:d  Correct radial distortion for all channels
                           Specifiy 'db' for database lookup or
                           the 4 coefficients a:b:c:d
     --blue=db|a:b:c:d   Correct radial distortion for blue channel,
                           this is applied on top of the --green
                           distortion coefficients, use for TCA corr
                           Specifiy 'db' for database lookup or
                           the 4 coefficients a:b:c:d
     --red=db|a:b:c:d    Correct radial distortion for red channel,
                           this is applied on top of the --green
                           distortion coefficients, use for TCA corr
                           Specifiy '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
     --aperture=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
     --help             Display help (this text)
     --output=name      Set output filename. If more than one image is given,
                           the name will be uses 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

Notes

Finding the correct lens correction parameters can be done using several approaches (see Lens correction model and external links for details). Note parameter d for radial distortion (default 1.0) is not available in GUI frontends - the d mentioned in frontends is typically a different parameter related to image shift.

Windows batch usage

Once you have calculated fulla parameters as described above, you can create a custom droplet for batch correcting photos like so:

• Create a Shortcut to fulla.exe by dragging the fulla icon to another directory in Windows explorer
• Edit properties
• Change the target to include your correction parameters:

 "C:\Program Files\hugin\fulla.exe" --red=0:0:0.00056:1.00015 --blue=0:0:-0.00026:1.0011 --vignetting=1:0.20:-0.51:0.2

• Rename the shortcut to something descriptive like fulla-peleng
• Now you can correct photos by dragging and dropping them onto the icon

External links

• Correcting TCA with hugin and fulla
• PTLens database download (April 2006)
  • Lensfun SVN includes parameters for many more lenses
• How to determine lens correction parameters - from Lensfun documentation