Dust Removal with Flatfield
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Dust can get into camera optics. In panorama images created from such photos the repetitive pattern can be particulary irritating, as a dust speck or a dust speck pattern tends to show up multiple times.
One can prepare a flatfield for correction. While one may correct the input files prior to stitching precessing each with the gimp for example, a much smoother workflow results if the stitching software itself provides for the use of a flatfield.
Flatfields may also be used to correct vignetting, or vignetting correction and dust removal combined. But even with hugin 0.7 using a parametrisation approach for vignetting, a suitably prepared flatfield is useful for dust removal. -- Klaus 19:11, 2 December 2007 (CET)