P: Artefacts when using shadows, clarity and image warp (lens corrections)

A very faint and "thin" version of the artefacts can be seen when no lens correction is applied at all. It can be seen most clearly at high contrast edges.

Here is an example (100% crop from a larger picture):

Image #1: Adobe defaults, no manual or profile lens corrections, no clarity.
Image #2: Plus clarity +100, you can see the faint "thin" artefacts already
Image #3: Plus manual lens correction rotation +0.1, the artefacts become "full-blown"

Yes! The haloing is gone! Thank you for the work around! Though I don't really wish to do without distortion correction as a default setting, your suggestion is certainly a simple solution until the bug is corrected. At least I now have access to the other correction controls (including the new defringe controls!). Thank you so much for your help!

The only items which were activated were 'Enable Profile Corrections' and 'Remove Chromatic Aberration'.

This is why I said you must also set the Lens Profile "Distortion" amount to '0.' You can then update the Lens Profile by clicking on 'Setup' (under Enable Profile Corections checkbox) and select 'Save New Lens Profile Defaults.' You will need to do this for each lens type and you can always change it back later.

I personally set all my lens profile defaults to '0' Distortion and only use it when there is visible barrel or pincushion distortion in the image. Wide angle zoom lenses typically have some barrel distortion and correction will cause the image periphery to become elongated and cropped. I actually prefer the look without distortion correction, especially for ultra wide angle landscape shots.Try both 100% and then 0% Distortion settings with one of your wide angle landscape images to see what I'm talking about.

Once you do this you should not see the haloing artifacts. Let us know.

Profile-based or manual — this does'n matter. Any geometric transformations trigger the bug.

The problem is, Todd, I hadn't used any of the Transform controls; they were all set to '0'. And yet, I still got this strange haloing. The only items which were activated were 'Enable Profile Corrections' and 'Remove Chromatic Aberration'. The problem seems to be more complicated than I imagined. I hope the bug will be fixed in the LR 4.1 final release.

For now you can set the 'Lens Corrections' Distortion and Transform controls to '0' prevents this issue and allows using all of the other controls, including the new Defringe Color tools. The 'Crop Overlay' Angle tool can also be used if you need to rotate the image. This should be helpful with landscape images, but obviously not a perfect solution for all images.

This bug will be fixed in the LR4.1 final release.

I've encountered a bug in LR 4.1 RC2. When working on a very contrasty image where extreme 'Highlights' reduction and 'Shadows' boosting are required, a strange kind of haloing appears along the edges of dark objects which border on a light background. As landscape photographer, I've found this happening along the edges of dark tree bark adjacent to a background of light sky. What makes this behavior even more puzzling is that by disabling 'Lens Corrections', the halos go away! I can not duplicate this behavior with LR 4.0. It only happens with the RC2 version of LR 4.1. What a shame! I find the new color fringe correction tools a major improvement! Thank you for any help you may offer.

Thanks! Yes, now the "solved" makes sense 🙂

may be solved in the Lr4.1 final....