Lens Distortion Correction using BreezeBrowser Pro
This photo was taken with a Canon EOS 20D and Canon EF 15mm lens and the original image shows marked barrel distortion which has been corrected using BreezeBrowser Pro.
BreezeBrowser Pro uses the shooting data in the image to lookup the lens correction factors and the applies high quality algorithms to correct for the lens distortion while maximizing image quality.
Lens distortion correction can be applied automatically when converting raw files in BreezeBrowser Pro. It can also be applied to other image types using the proofs tool. Lens distortion correction should not be applied to images that have been cropped because this will result incorrect adjustments resulting in distorted images.
BreezeBrowser Pro uses the highly regarded PTLens profiles developed by Thomas Niemann to lookup the correction parameters. The PTLens profiles contain a wide range of different lenses calibrated for different cameras and more are being added all the time. BreezeBrowser Pro is able to read the PTLens profile files and so new profiles can be added to BreezeBrowser Pro simply by downloading them from the PTLens site and copying them into the PTLensProfiles folder where BreezeBrowser Pro is installed. The latest lens profiles available at the time will be included in each new release of BreezeBrowser Pro.
Lens distortion correction can only be applied to images that contain shooting data with lens focal length information. Some editors and raw conversion tools do not preserve all of the shooting data when saving images and this can prevent BreezeBrowser Pro from looking up the lens information and correcting the distortion. If this happens you can use the EXIF copy tool in BreezeBrowser Pro to copy the shooting data from the original image to the edited image and then run proofs to correct for the lens distortion.
Different types of lens distortion
Barrel distortion is where the edges of the image bow outwards making the image barrel shaped. It is common in wide angle lenses and in zoom lenses at their wide angle settings.
Pin cushion distortion is where the edges of the image bow inwards and is less common than barrel distortion. Some zoom lenses show mild pincushion distortion when set to their telephoto setting.
The lens distortion correction in BreezeBrowser Pro can correct for both barrel distortion and pin cushion distortion. BreezeBrowser Pro reads the shooting data from the image to determine the type of lens used to take the photo and the focal length used. It uses this lens data to lookup the appropriate lens correction parameters in the list of PTLens profiles and then uses high quality interpolation algorithms to correct for the distortion. The PTLens profiles for zoom lenses usually have different correction coefficients for different focal lengths so that lenses which exhibit barrel distortion at one focal length setting and pincushion distortion at another setting can be corrected for throughout their zoom range. Please see the PTLens website for more details on lens distortion correction and on calibrating lenses.
PTLens was developed by Thomas Niemann and the PTLens profiles are used in BreezeBrowser Pro with his kind permission. Please note that lens and camera definitions created before June 2006 are free. To use lens and camera definitions created after June 2006 it is necessary to purchase a license for PTlens from http://www.epaperpress.com/ptlens.
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Lens distortion correction using BreezeBrowser Pro