How to quantify chromatic aberration?

In Camera Raw, the chromatic aberration is specified as a integer in [-100,100], but I'm not sure about its quantitative meaning. For example, if I set red/cyan fringe to +100, how many percent will the red channel be larger than the other two channels?
In www.photozone.de, CA is given as the number of pixels at the image borders. I guess the borders means the left and right borders in landscape orientation. For example, "2 pixels at the border" for a 3000x2000 image means 0.133% (2/1500). By the way, I don't think it is a good way to quantify CA because the same lens will thus have different CA value for different pixel density.
In DCRaw, CA is directly specified as a enlargement ratio. Quoting from DCRaw manual: "-C red_mag blue_mag: Enlarge the raw red and blue layers by the given factors, typically 0.999 to 1.001, to correct chromatic aberration". It gives minimal ambiguity, and the same lens will have the same CA value no matter in full frame or APS-C, no matter in 8MP or 10MP.
Come back to my question. I'm asking this because I already measured the CA of all my photos. Now I'm switching to Camera Raw, and want to make use of my old measurement. So I need a way to do the conversion.
Thank you.

Thanks everyone for your help. It is certainly a correction tool that Apple should build into Aperture. I'm aware of the suggested workarounds but as you can reduce CA in most other programs I would expect it in Aperture as well. I'll leave Apple a feature request for this. Thanks

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How can I repair chromatic aberrations in PSE?

Hello,
how can I please repair chromatic aberrations (the edges around are red, green or violet colored, this might not be) of my Fujifilm Finepix A500, 5,1 MP? I have Photoshop Elements 8 and I can not find a button to remove the aberrations. Can you please tell it step by step. I have not so much experience with PSE 8. You can write to me in English, German or Czech language. Thank you in advance.
Sincerely
Lesnivila

Lesnivila,
I some cases you might be able to remove the aberration with a Hue/Saturation adjustment layer. In this example, in the H/S saturation dialog box I selected red from the list and moved the Saturation slider all the way left. This desaturated most of the picture but I then filled the layer with black to restore the original. Then I activated the Paint tool and painted with white over the red portion to restore the desaturation.
I only painted the red on the sweater along the left portion of the table leg so that you can compare it to right portion.
Note: If you paint too far, for example onto the table leg, then undo it by painting with black to restore the original. If you initially set the foreground/background colors to their default black/white values, you can type "X" to toggle between black and white while painting.

? The Chromatic Aberration slider in Camera Raw V. 6.7 disappeared.How do I retrieve it?

The chromatic aberration slider in the Lens Correction panel in Camera Raw 6.7 (PS CS5) has disappeared. Must I re-download again, or?
If I do, should I uninstall what is on the computer now? I use a Mac. Robert C. Tanner

The CA corrections are now automatically applied using a checkbox, the sliders are gone (and won't be returning).

Camera Raw problem with Chromatic Aberration

I am using bridge CS5 (version 4.0.5.11) and working in camera raw. In the lens corrections tab in the manual control I have lost my chromatic Aberration controll, this is to say, it has disappeared. I now see under the manual tab I now see the transform controlls, below that I see lens vignetting. The chromatic aberration conrolls have disappeared, where have they gone and can I get them back and how do I do that?

They're gone for good as of Camera Raw 6.7 and newer.
Adobe replaced them with an automatic process they say is better, and to be honest it usually works very well.
Folks have posted about a few cases where it doesn't work, but they seem to be exceptions, and so far Adobe is showing no signs of restoring controls to the user.
See also: http://forums.adobe.com/message/4397207#4397207
-Noel

Better chromatic aberration repair than ACR? Plugin?

I've suddenly (and sadly) become wise to the existence of chromatic aberration in my images. I'm finding that it's different from image to image - undoubtedly due to different lenses, zoom setting, etc.
I've been using ACR's chromatic aberration fix to generally good effect, but since it's different from image to image, it's not possible to just save settings as a template to use with every image. It's not a LOT of work to tweak each image, but I was wondering whether there was any "miracle" CA-fixing plugin out there that I should know about. Similar to how Noise Ninja seems to do a better job with noise than Photoshop's built-in tools.
Any recommendations?

http://www.dxo.com/us/photo/dxo_optics_pro
It's expensive, but works wonderfully.

Zoom does not reflect Chromatic Aberration in Develop

Hello
Have anyone noticed that in LR 1.0 (last build) the chromatic aberration correction shows up correctly if image is zoomed (for precise correction) but remains the same (not corrected) if the "fit" zoom is restored?
I corrected some .ORF (Olympus) RAW and found that if zoomed the correction (after playing with CA cursors) is ok (no more visible red/green fringe) but restoring the default zoom to see the full image doesn't show the corrections made. And the aberration is very strong so is visible even at "fit" zoom.
Does the Develop module not resample/redraw the image using a preview?
I think can be misleading to correct CA and not see changes reflected at all zooming.

Great.
These changes aren't viewable in the Develop module, except at 1:1. Gee, real helpful for 24 megapixel images... viewing at 1:1 that is. Unless, of course, I have a 42" high-quality LCD that, oh, doesn't exist yet.
And the Library module will probably just show the image with banding/JPEG macroblocking, so, no use there.
So, looks like the only option to view your CA/noise/sharpening-adjusted image fitted on your screen in high quality is to first EXPORT the file then VIEW in a viewer OTHER than LR.
Fascinating, how LR is such a wonderful image EDITOR, but is worse than just about every other piece of software out there for VIEWING.
Sorry, but even hyperbole doesn't suffice here. It's really just shocking that LR is the crappiest image *viewer* I've seen to date.
Actually, more shocking to me is that it seems that people *don't even care* about LR's sub-par viewing capabilities. Save for all my posts and one corroborating post by Andrew Rodney & another one by someone I can't remember (apologies!) -- no one has complained about the ridiculously horrid image quality when viewing images outside of the 'Develop' module. I mean, for a program that's all about 'aesthetics' and 'focusing on the image' (lights out mode, etc.), why show me a sub-par view of my images? Aren't my images the most important part of the whole picture??
And what's with all these optimizations for speed? Cutting corners here and there for speed...? On my 5400RPM hard drive MacBook Pro (ok, fine, Core 2 Duo w/ 2 GB of RAM), LR is *blazing* fast and I work with 120MB 16-bit film scans and I NEVER find myself sitting around for LR to perform a calculation, etc. It's *fast enough*... now how about putting some emphasis on *quality* back into the program rather than crippling the program so it runs faster (or not, if you have a decent machine anyway)?
Or how about at least giving us the *option* to enable purportedly 'high-end' features like, uh, viewing an image in full quality when presenting a slideshow to friends, or, *gasp*, PAYING CLIENTS...!!
Gosh I love Lightroom, and have mad respect for the developers... they are brilliant, intelligent, revolutionizing everything. But, man, sometimes these fundamental omissions, and lack of their recognition by the community at large, drive me insane!
Many apologies for the rant, since I know some people out there would like to bite my head off for being so caustic :-P
-Rishi

Auto-optimize chromatic aberration settings

This is actually pretty simple to implement, has an obvious interface, and would be very handy.
Add a dropper/crosshairs type tool to the CA module. When touched to the image it will fiddle with the CA settings until the fringing in that area is minimized. This could converge very quickly and accurately in an area like a backlit edge. If it doesn't converge, no big deal, do nothing and let the user try another point.

Yes, and I think version 1 had it too. The high-end cameras adjust in-camera too when producing jpegs.
There's a lot of talk about proprietary lens tables and encrypted raw files on the internet, but I'm almost certain that these are not required. If I can remove aberration by adjusting a couple of sliders and the alt/option key at 400% with a squint, without any lens tables, then it must be possible to do this automatically in software by measuring the green/magenta or yellow/blue levels in an image (or part of an image).
Of course, the proof of the pudding would be in how Nikon cameras and Capture NX deals with non-nikon lenses, like Sigma, Tamron, and Tokina. Do they get corrected too?
There seems to be a trend at Nikon of producing cheaper lenses with quite a bit of lateral chromatic aberration. It makes good business sense to save money on materials if the effect is easily (and cheaply) fixed in post-processing (as long as the aberration can be removed satisfactorily). So the problem isn't going to go away; it may even get worse.

The chromatic aberration checkbox that should be under lens corrections is missing

The chromatic aberration check box that should be present under lens corrections is missing from my LR4 program, can anyone tell me what the problem is and how to get it back

What version of LR4 are you using? There was a change made to the CA removal process in LR4.1, and the "Remove Chromatic Aberration" check box is now under the "Color" tab of the Lens Correction panel.

CS5 Chromatic aberration sliders missing

CS5 camera raw, under lens correction tab, profile, no chromatic aberration slider. Under the manual tab, same thing. Do I need to download an update?
Thanks,
Vince

Nope. The controls have been removed on purpose in Camera Raw 6.7 and they're not coming back.
Adobe thinks their automatic CA removal is better, even though examples have been shown where it's not.
See also: http://forums.adobe.com/message/4397207
You are forgiven for thinking that every new version should be made more capable than its predecessor and make better quality images. Apparently Adobe feels other factors (ease of use?) trump this.
If you don't need new camera support it's possible you can revert your Camera Raw plug-in to version 6.6, which still has the controls. It gets a bit geeky, but I can advise you further how to do that if you'd like.
-Noel
P.S., It's easy to show that the newer method doesn't always work as well. Note this Canon 10-22 image including the moon near the upper-left corner as opened with Camera Raw 6.6 vs. 6.7.
-Noel

Chromatic Aberration Removal in LR4 is terrible

I used a manual fixed focal length penatx lens on my Canon 40D and it shows chromatic aerration in the raw file. In LR4 all you can do is check the option to remove chromatic aberration. LR4 did an awful job making it even worse. See before and after image below. The chromatic aberration should have manual controls to adjust it to one's liking. Red/Cyan and Blue/Yellow sliders should be complemented by a Green/Magenta slider in the manual section. Now that would be an improvement on LR3. I loathe chromatic aberration which is unavoidable in many cases. More control over it's removal is a definite must. LR4 has gone backwards. I don't want to have to fiddle with profiles etc to fix this. Just put the controls that were in LR 3 back and add a green/magenta slider please.

I'll try the moire brush as suggested.
I am trying to emphasise the point that the software should be moving forward. That means new tools or upgrades should avoid adding artifacts as much as possible and certainly upgrades to existing tools should not perform worse than the original tool. I have found an example here where it does with chromatic aberration removal where an artifact is formed.
It's interesting that some of the commentary above almost suggests that chromatic aberration removal should be an adjustment brush. The user could then isolate the edges that he/she wants to remove the coloured fringes from. Then there should be the ability to choose which colour shifts are required red/cyan, blue/yellow, or green/magenta.
It looks like the current tool may improve some edges while making others worse. If checking the choice of automatic aberration correction doesn't work - then one has to go to another external editor to fix the problem - not the most satisfactory result of an upgrade. I like the suggestion in another thread of having both the option of auto and manual control options - much like exposure control. Photographers like manual control of image enhancements.
I have chosen to take pictures that have extreme aberrations to test the robustness of the tool. I have shot pictures with high contrast lighting, with older cheaper glass, and with the aperture wide open. I'll try to get some pictures to Eric as mentioned above.

Lr and NEF Chromatic Aberration

Dear All,
The more I look at (D700) NEFs in Lr, the more I think Lr does not do justice to them (note that I do not blame Adobe for this). Indeed, if I look at Lr's rendition of NEFs compared to the in-camera generated JPEGs, I see chromatic aberrations which are not present in the JPEG. For instance compare
with
Clearly, the top image exhibits much less chromatic aberration than the second. Now, the top image is the JPEG and the bottom one is the NEF. Clearly, Nikon's on-board chip knows more about rendering the raw image than Lr does. Anyone else seen this effect ?
With the introduction of camera profiles in V2.4, Lr made a step in the right direction. Now the question is: When will Lr be able to do at least as well as Nikon's on-bord chips when it comes to chromatic aberration ? Couldn't Adobe "buy" Nikon's "secret" and get Lr up to top speed ?
Thanks for your time and input, folks.
++
Jepoma

Sorry, but the camera generated jpg includes all of Nikon's in-camera processing. There is no reason why a nef in LR should duplicate it exactly. Since Nikon is perhaps the hardest core about making certain information proprietary, you are comparing apples and oranges, or more appropriately a raw apple to an apple pie made with a secret recipe. From my perspective, LR will never do "as well" as the on board chip because you aren't seeing the results of the onboard chip anyway but rather the processed data from that chip. Actually, the LR image is likely closer to the unprocessed data than the jpg. Personally, I don't like Nikon's in-camera processing (and have never been comfortable with the detail I am losing with Nikon jpgs), so I shoot exclusively raw and am happy to do all the adjustment in LR.
As far as Adobe buying "the secrets" from Nikon, I just think that is a bit naive. That assumes that Adobe is the stumbling block, when the reality is Nikon has pushed to keep things propietary and sells its own (lousy) software to take advantage of the propietary aspects. BTW, of course you are blaming Adobe - LR is not a living being, it is a piece of software designed by the people at Adobe. If it doesn't do what you want and you are comparing it unfavorably to the Nikon straight-from-camera jpg, you would appear to be attributing a deficiency to someone. Based upon the rest of the post that certainly would appear to be the producers of LR....
Stephen

Edit in photoshop loses chromatic aberration corrections

Hi
I have a problem I have not noticed before... when I do a chromatic aberration correction in Lightroom, then do "Edit in Photoshop", it opens in PS but the chromatic aberration is still there, uncorrected. It seems to be applying other corrections okay, just not the CA correction.
If I export the image as a tiff, then open it in PS, the chromatic aberration correction looks good. See the images below.
I have been using Lightroom for years but not in the last year. I don't have the memory I used to have so I keep thinking I am just doing something wrong. Can anyone help?
Thanks,
Steve

Mitch,
I have seen the same when working with Adobe photo editors and in my case it turned out there were multiple copies of the image, one flattened and one with the layers. I need to nail this one down so I will get on this it evening when I get some time. In the mean time, check and see if there is another copy with the layers intact.
Dave Huss

Is there a chromatic aberration or purple fringing tool in PSE 10?

The subject line basically says it all. The chromatic aberration tool in Aperture doesn't do much for me. Is there one in PSE 10? Thank you.

Well, PSE's implementation of ACR can help correct chromatic aberration somewhat. Here's the original image from somegirl's web site:
Using these settings:
Results in this:
Not great, but better than I expected.
Ken

Chromatic Aberration Gone

I don't know exactly at what point this happened, perhaps with the 4.1 update, but the Chromatic Aberration check box has disappeared from Lens Corrections panel. It isn't where it was a while back under the Profile tab; nor are the old fringe tools available under the Manual tab; the Defringe pup-up menu is also gone. What gives?
I helped a friend upgrade from Lightroom 3 to 4 yesterday and found the same issues on here computer.
What gives?

Thanks, guys. I finally figured it out after some more tinkering. But the infor is not, unfortunately, in Scott Kelby's Lightroom 4 book, which was published before the change. If you can point me to any tutorials for the new version of the Defringe panel I'd appreciate it.

Chromatic aberration being introduced to RAW file by PS CS3

I have been working on some old photos (Canon 10D RAW files) and when I open the files in Photoshop I find that the file has severe chromatic aberration (introduced upon opening). While in ACR, the file is fine (no CA) but when it opens in PS there are significant green and red shifts (unfixable using the lens correction filter). This happens regardless of whether I open the file as a smart object, a 16 bit or 8 bit file. I have recently loaded OSX 10.5.1, and the PS version is 10.0.1. Has anyone else had this problem?

>While in ACR, the file is fine (no CA)
You may need to zoom into the corners of the image to 200-400% to see and correct CA as well as other fringing. The Lens correction DOES produce reduced or eliminated defringing if you properly use it. If you have a question, post the raw file.

How to quantify chromatic aberration?

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