My Panoramas Have Vignetting - GigaPan Epic Pro User Manual

6.8 My panoramas have vignetting

Vignetting is the result of less light reaching the edges and corners of a photo than
the center of a photo. Vignetting manifests itself as a pattern of stripes in a panorama.
You can adjust camera settings to minimize vignetting and you can reduce vignetting
using an image editor before stitching the photos together.
Methods of minimizing vignetting while capturing photos
1. Reduce the diameter of the cameras diaphragm by using a larger aperture value such
as f/8 versus f/4. The aperture value is inversely proportional to the diameter of the
diaphragm opening.
2. Use a smaller focal length such as 200mm versus 400mm.
3. Use a petal type lens hood or no lens hood.
4. Newer Nikon and Canon cameras have vignetting compensation settings that help re-
duce vignetting for supported lenses. Nikon vignetting correction controls are located
in the custom function menu. Newer Canon cameras support 'peripheral illumination'
settings for certian lenses.
5. Increase the amount of overlap to an percentage higher than the EPIC Pro default of
30% using the 'Picture Overlap' setting in the EPIC Pro Menu.
Post processing photographs to remove vignetting before stitching
At times you may need to rely on editing your photos in post-production because your
camera adjustments during the capture of the panorama were not enough to eliminate
vignetting or the settings would have prevented you from capturing the images due to
low light conditions. Note that you are able to adjust jpeg format images to minimize
vignetting, but you are able to make a more aggressive adjustment to files that are in
the camera RAW format.
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