I have some photos with very problematic chromatic abberation that the LR3 settings were able to help with a little, but LR4 literally does nothing with when I turn "Remove CA" on. It's as if the feature isn't activated yet -- there is no change whatsoever.

Here are three (admittedly lousy) photos from that batch, taken with a Canon 20D and Canon EF 85mm f/1.8 USM. Feel free to use them for testing.

http://dl.dropbox.com/u/7473520/_MG_4942.CR2

http://dl.dropbox.com/u/7473520/_MG_4962.CR2

http://dl.dropbox.com/u/7473520/_MG_4971.CR2

The only program that was able to automatically and successfully remove CA from the images from this particular lens was DxO -- which did an amazing one-click job. Unfortunately, it's the only thing I like about the program and I want a Lightroom/Photoshop-only workflow. It'd be great if Adobe could get to that level of success -- it's a huge timesaver when CA does occur.

Thanks!

I don’t see any CA to remove in these three images.  DxO may know how to remove other types of fringing but the aberrations in these are not classic CA that LR handles. 

There is purple-lime fringing due to highlight edges being out of focus and some blue overexposure fringing, but LR3 manual CA adjustments just make things worse.

One comment I would make is that it might be nice to have the old CA-sliders back at least if things are PV2010.

Playing with it a little more, it's not quite so 100%.  I REALLY like the option to have automatic.  it makes cleaning up a lot of the photos much easier, but sometimes it seems not to detect it (particularly in cases where there's not a lot of obvious in focus aberrations.  Don't have much imported yet, but for instance, the backscatter in the upper left/lower right of this image isn't corrected (in lightroom 3 this is easy to pull out with the sliders, but in 4 i see essentially zero change depending on whether the button is pressed or not):

http://dl.dropbox.com/u/39478191/_MG_4978.CR2

Not having played with it yet I'm curious about something.  When I apply auto correction it adjusts for everything: distortion, vignetting, CA.  All well and good.  But unless I have a specific issue with distortion I don't both bending the pixels so zero it.  And I always zero vignetting as I like the aesthetic.  Either adjustment changes the lens setting from Default to Custom.

Here is the question: in the past I've noticed that custom lens settings retain the specific lens profile, even when when a different lens was used.  Leaving the setting at default allowed this feature to be used as a preset or initial import setting and would automatically adjust to the new lens.  In LR4 can I zero out the distortion and vignetting, leaving only auto CA active, and maintain that as the default import setting that will still self-adjust to whatever lens is represented in the meta data?

Hope that makes sense as I'm finding it difficult to explain.  Too much caffeine perhaps.

Presumably this is still lateral CA – the different color channels are slightly different magnifications – so could be corrected by either a more sophisticated CA-model or averaged out by manual sliders.  With manual sliders, the CA wouldn’t necessarily be entirely gone, but the some CA color offset could be shifted somewhat from the extreme outer areas to more in the middle where it is already less.

We need the manual sliders, back, for use in special cases such as this.

I can think of another use for manual CA sliders.  If there is a large aquarium in a photo, where the water-based CA amounts are different than the air-based CA amounts elsewhere, if the CA-model removes CA according to the air, but my subject is in the aquarium, then I’d like to be able to change the CA-adjustment amounts to remove the CA in the water area and perhaps shift the error to the background outside the aquarium where the edges are less sharp and the CA less obvious or that I’ve cropped away.

The lens-port CA and the aquarium CA would both be symmetric.

Pamvphoto wrote:

 

I would agree with bringing back the slider adjustments! Please! Bring them back!

 

The preset works fine for some images, but the photo I'm working with at the moment, still has a red edge I can't get rid of!
The suggestion to use the local adjustment brush to paint away the color fringe, is time consuming and unnecessary, when the sliders in v3 took care of it.

 

You sure? I suggest you change it to PV2010 in LR 4 and see if you can really get rid of it.

By that logic LR should have no sliders and only an Auto button.  Of course the more images as LR can automatically adjust CA for the better. 

"You sure? I suggest you change it to PV2010 in LR 4 and see if you can really get rid of it."

At this time LR 4 is a tad buggy on my Mac Pro.

Changing to 2010 crashes the app every time! When I re-open the app it continues to crash. :/

That looks like longitudinal CA to me.

I think the interesting thing this conversation is exposing (from a user standpoint) is that we require control for fringe removal, regardless of the technicalities of the fringe. A user shouldn't have to ask or answer questions about whether or not it is CA, or whether it is longitudinal or latitudinal, nor should we need to understand Adobe's algorithms or be able to pre-determine whether an auto-button will get rid of them. A pro program should be able make tackling a range of scenarios simpler with automated controls, but there should always be override capability with fine-grained manual controls for those problems that are edge cases.

MadManChan2000 wrote:

 

On the other hand, I can see value in having manual controls that solve the correct problem.

.

I also just noticed that the Chromatic Aberration sliders are missing from LR4. I was always able to effectively remove any measure of CA from my images with these tools. I tried setting both the "Remove CA" and "Defringe-All" controls to On in LR4 with a new image having what I would describe as "hard-to-find" CA. I noticed only a minimal change. Not having the CA sliders for Red/Cyan and Blue/Yellow is a disappointment. Is there a reason why we can't have BOTH (Auto and Manual)? That would be the best of both worlds.

J Rhodes

New Mexico

I do have some issures too with chromatic abberations. My raw file is available here : http://cl.ly/2I1e0r3X3l2l271j2R3H

I have some more RAWs if needed of the same album that my help you.

Please let me know if you need anything else.

Great example of what? It is axial, not lateral CA, isn't it?

Or... does it mean you're working on automatic axial CA removal for the beta2?