How do I manually correct chromatic aberration in Lightroom 4 if the old sliders are gone?

Question

After upgrading to Lightroom 4, I noticed the older chromatic aberration sliders are no longer in the same form as previous versions. I often shoot wide open with a Canon 50mm f/1.4 and sometimes get purple fringing mixed with halation, where I used to fine-tune CA manually.

In Lightroom 4, I see:
- a "Remove Chromatic Aberration" checkbox under Lens Corrections > Color
- Defringe controls/manual options instead of the old CA sliders
- lens profile correction options, which don’t always help with this lens

Why did Adobe remove the older CA sliders, and what is the best way to manually fine-tune chromatic aberration in Lightroom 4, especially for purple fringing or residual CA around halation?

user5270 · Answer

Lightroom 4 is a huge win if you have Chromatic Aberration. However, it addresses the problem differently than previous versions and in fact, than most other tools.

Scroll down to the Lens Corrections panel, and click on "Color". Then check the "Remove Chromatic Aberration" checkbox. This alone may help. However, you can dial it in: What sort of CA do you want to remove? I just processed an image with the dreaded purple fringing. So, I slid the top Amount slider up a ways, then took the eyedropper and clicked on the fringe. Presto. Gone.

The blue/yellow slider works pretty much the same way. You just have to play with it and make sure you've backed the amount down to the lowest acceptable setting so you don't compromise other parts of your image.

Here's a before/after of the image:

enter image description here

Side note: I just tried this on a Holga image shot on Portra film and scanned, just to make sure Lightroom would not have any lens info, and all the controls are still present. I'm not sure why you would be missing any of the sliders.

How do I manually correct chromatic aberration in Lightroom 4 if the old sliders are gone?

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