# fulla - Online in the Cloud

This is the command fulla that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

### PROGRAM:

#### 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)

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

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: 2015.0.0" 2016-01-06 FULLA(1)

Use fulla online using onworks.net services

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