Adobe Photoshop Lightroom CC - Manual (Page 177)

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Processing and developing photos
Last updated 4/20/2015
Barrel distortion causes straight lines to appear to bow outward.
Pincushion distortion causes straight lines to appear to bend inward.
Chromatic aberration Chromatic aberration appears as a color fringe along the edges of objects. It is caused by the
failure of the lens to focus different colors to the same spot, aberrations in sensor microlenses, and by flare. Lightroom
provides a checkbox to automatically correct blue-yellow and red-green fringes, also known as lateral chromatic
aberration.
Lightroom 4.1 and later provides slider controls to correct purple/magenta and green aberration (axial chromatic
aberration). Axial chromatic aberration often occurs in images made with large apertures.
Correct image perspective and lens flaws automatically
The Profile options in the Lens Corrections panel of the Develop module correct distortions in common camera lenses.
The profiles are based on Exif metadata that identifies the camera and lens that captured the photo, and the profiles
compensate accordingly.
Lens profiles are saved in the following locations:
Mac OS /Library/Application Support/Adobe/CameraRaw/LensProfiles/1.0/
Windows Vista or Windows 7 C:\ProgramData\Adobe\CameraRaw\LensProfiles\1.0\
Note: The lens profiles that are available in the Lens Corrections panel depend on whether you’re adjusting a raw or a non-
raw file. For more information and a list of supported lenses, see the Adobe Support article
Lens profile support | Lightroom,
Photoshop, Camera Raw .
1 In the Lens Corrections panel of the Develop module, click Profile and select Enable Profile Corrections.
2 To change the profile, select a different Make, Model, or Profile.
Note: Some cameras have only one lens, and some lenses have only one profile.
3 Customize the correction by adjusting the Amount sliders:
Distortion The default value 100 applies 100% of the distortion correction in the profile. Values over 100 apply
greater correction to the distortion; values under 100 apply less correction to the distortion.
Vignetting The default value 100 applies 100% of the vignetting correction in the profile. Values over 100 apply
greater correction to vignetting; values under 100 apply less correction to vignetting.
4 (Optional) To apply your changes to the default profile, click Setup and choose Save New Lens Profile Defaults.
Correct chromatic aberration
In the Develop module Lens Correction panel, click Color to display the chromatic aberration and defringe controls.
Note: To get a better view of the result, zoom in on the image area that shows the aberration.