LR 4.1 RC: Remove CA reduces in some areas and increases in others?
I have 2 screenshots of LR 4.1 RC using the option to remove the Chromatic Aberration. The first is before and the second is after. Note that in the front where I wrote the number 1 there is color in the Red fringe and where I wrote the number 2, it does not exist. Then when I choose to remove the Chromatic Aberration the region number 1 is better but the region number 2 is worse. Perhaps nothing can be done, or maybe that I've done something wrong or maybe I don't understand something, or maybe something else?
Before:
After:
There are two types of Chromatic Aberrations (CA), lateral (axial) and longitudinal (transversal):
http://en.Wikipedia.org/wiki/Chromatic_aberration
CA LR tools are designed to correct only longitudinal aberrations, which is the type that becomes more pronounced as you get more far away from the center of the image. Axial aberrations color (purple fringing) is generally uniform size throughout the image, but more visible along the borders in areas of high bright lights dark. Yes, you can correct axial in a specific area of an image with tools CA LR3, but then it will introduce longitudinal CA in the rest of the image. In the area of the photo you have posted, I suspect CA axial and longitudial are present. LR4 automatically corrected lateral CA, revealing the presence of axial CA.
LR3 both LR4 have a "Fringe" tool located under 'Manual' in the Panel of the Corrections of the objective, which is designed to remove axial CA. Take this same picture and try to check the 'fringe' > option "all sides." Try to use both with and without the ' remove Chromatic Aberrations "checked. The LR ' fringe tool does a good enough job by removing most if not all the "purple fringing," including sensor overload fringes commune with smaller sensors (i.e. crop sensor, point & cameras).» It does not reduce the sharpness or add any visual artifacts, at least for images that I've dealt with it. Interestingly, software Nikon View NX actually provides separate tools for axial and lateral CA:
I suspect the NX Axial CA tool performs similar to the "Fringe" LR tool, but with a cursor instead of two parameters (edges highlight, all edges).
Post edited by: trshaner: corrected link Nikon View NX.
Tags: Photoshop Lightroom
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