Vignetting

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== Definition ==
 
== Definition ==
  
Light fall-off in the corners of images due to lens characteristics. There are mainly two types of vignetting. One caused by the lens housing sometimes called artificial vignetting and one caused by optical reasons (cosine-in-4th-power law) sometimes called natural vignetting. Only the last one can be easily corrected by the [[Panorama Tools Plugins]] radial luminance filter.  In principle [[Fulvio Senore]]'s [http://www.fsoft.it/Imaging/Vignetting.htm program for vignetting correction] can correct both types of vignetting.
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{{Glossary|Light fall-off in the corners of images|1}} due to lens characteristics. There are mainly two types of vignetting. One caused by the lens housing sometimes called artificial vignetting and one caused by optical reasons (cosine-in-4th-power law) sometimes called natural vignetting. Only the last one can be easily corrected by the [[Panorama Tools Plugins]] radial luminance filter.  In principle [[Fulvio Senore]]'s [http://www.fsoft.it/Imaging/Vignetting.htm program for vignetting correction] can correct both types of vignetting.
  
 
Although the [[Panorama Tools Plugins]] radial luminance filter implements vignetting correction, this functionality was never added to [[PTStitcher]].  In this case it is necessary to pre-process photographs with the plugin or some other tool.
 
Although the [[Panorama Tools Plugins]] radial luminance filter implements vignetting correction, this functionality was never added to [[PTStitcher]].  In this case it is necessary to pre-process photographs with the plugin or some other tool.
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[[nona]], the stitcher supplied with [[hugin]] now implements vignetting correction at the stitching stage, this uses either a flatfield image or a polynomial function.  [[fulla]] is an image pre-processor that uses the same technique to correct vignetting along with [[chromatic aberration]] and [[lens distortion]].
 
[[nona]], the stitcher supplied with [[hugin]] now implements vignetting correction at the stitching stage, this uses either a flatfield image or a polynomial function.  [[fulla]] is an image pre-processor that uses the same technique to correct vignetting along with [[chromatic aberration]] and [[lens distortion]].
  
[[hugin]] now has a feature for automatically deriving vignetting correction parameters from an assembled panorama.  It compares the brightness gradient difference between overlapping photos at different radii, and [http://article.gmane.org/gmane.comp.misc.ptx/4690 calculates a suitable correction polynomial].
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[[hugin]] now has a feature for automatically deriving vignetting correction parameters from an assembled panorama.  It compares the brightness gradient difference between overlapping photos at different radii, and [http://article.gmane.org/gmane.comp.misc.ptx/4690 calculates a suitable correction polynomial]. [[PTGui]] has implemented the same technique based on Pablo's paper.
  
 
== See also ==
 
== See also ==
  
[http://homepage.ntlworld.com/j.houghton/vignette.htm John Houghton's page on Vignetting]
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[[w:Vignetting|Wikipedia page on vignetting]]
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[http://johnhpanos.com/vignette.htm John Houghton's page on Vignetting]
 
[[Category:Glossary]]
 
[[Category:Glossary]]
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[http://biecoll.ub.uni-bielefeld.de/volltexte/2007/101/ Pablo d'Angelo's paper on exposure, whitebalance and vignetting correction]

Latest revision as of 00:11, 4 January 2011

[edit] Definition

Light fall-off in the corners of images due to lens characteristics. There are mainly two types of vignetting. One caused by the lens housing sometimes called artificial vignetting and one caused by optical reasons (cosine-in-4th-power law) sometimes called natural vignetting. Only the last one can be easily corrected by the Panorama Tools Plugins radial luminance filter. In principle Fulvio Senore's program for vignetting correction can correct both types of vignetting.

Although the Panorama Tools Plugins radial luminance filter implements vignetting correction, this functionality was never added to PTStitcher. In this case it is necessary to pre-process photographs with the plugin or some other tool.

nona, the stitcher supplied with hugin now implements vignetting correction at the stitching stage, this uses either a flatfield image or a polynomial function. fulla is an image pre-processor that uses the same technique to correct vignetting along with chromatic aberration and lens distortion.

hugin now has a feature for automatically deriving vignetting correction parameters from an assembled panorama. It compares the brightness gradient difference between overlapping photos at different radii, and calculates a suitable correction polynomial. PTGui has implemented the same technique based on Pablo's paper.

[edit] See also

Wikipedia page on vignetting

John Houghton's page on Vignetting

Pablo d'Angelo's paper on exposure, whitebalance and vignetting correction

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