Chroma Blur and Chromatic Aberration

This question isn't about a problem, rather I'm looking for a comfirmation.
According to reviews on my two lenses, they're supposed to suffer badly from CA, yet I can't see any evidence in Aperture. Apparently, the CA in these lenses is easily corrected via software.
Adjusting Chroma Blur doesn't seem to do anything after import to reveal evidence of CA.
Am I right in assuming that Aperture is correcting CA during RAW import and that setting Chroma Blur to zero won't reveal it?

Another thought - sometimes what appears to be chromatic aberrations is actually an artifact of the sensor capture/decoding (see http://wiki.panotools.org/Chromaticaberration#What_it_isnot).
So Aperture may be doing a better job of lessening that effect - otherwise often seen as purple blooming - than whatever the reviewers used when they did their testing.
I'd stick with what you see with your camera, and your lens, rather than worrying about what any random third party reviewers might say.

Similar Messages

Nikon D300 and chromatic aberration

I've noticed quite pronounced fringing in raw files brought into Lightroom 1.4 from a Nikon D300 and it can't be adequately fixed using the Lens Correction controls.
Creating jpegs in-camera using RAW+jpeg gives jpegs with far better fringe reduction than I can get in Lightroom. It seems that Nikon Capture NX can give the same treatment to NEFs that the camera gives to jpegs, but it's not available in Lightroom.
That benefit is powerful enough to make me consider switching to NX rather than upgrading to Lightroom 2 (which doesn't appear have this feature either).
Alas, I've been allowing Lightroom to convert my NEFs to DNGs, so I imagine I've lost the metadata that NX uses to fix the CA on all my old files.
Has anybody got any useful info on any of this?

Nikon uses a software algorithm in the body and in NX to correct for lateral CA live. It does it for ANY lense you attach to the body. For RAW files, the info is written as metadata in the RAW file, which NX reads and uses as a first guess. Canon does the same in their DPP software. The math that Lightroom does in the lens correction section is the same. It just doesn't automatically determine the right settings. I have over time developed a set of presets that I will apply to files from certain lenses at certain focal lengths and this works OK, but not as good as the automatic fitting of the parameters that NX does. I had asked for something like this in the beta period, but it is probably not very high on the list of priorities. We'll see when and if it materializes. The algorithms to do this are simple (there is no reason to build a database, this is straightforward image processing stuff) but they are patent protected, so Adobe might not go there at all.

Presets for chromatic aberration correction?

I've been wondering about this one for a while - is this actually possible?
I believe that it hinges on the following - I know c.a. varies based on focal length, so I'd have to create a preset for each possible focal length from my zoom as I happen to use them.
But, does it also vary within a focal length by the focus distance? In which case, a preset is clearly not possible.
Thanks for any help.
Selby

I'd love to see geometric distortion, vignetting and chromatic aberration correction based on lens/camera combination built into Lightroom. I happen to be a Canon owner and though this functionality is available in Canon's Digital Photo Professional software, using it does mean a trip through Yet Another Program. Having everything integrated in lightroom makes life a lot easier (just think of Lightroom's excellent integration of ACR functionality).
BTW: there is an open thread called "Auto Chromatic Aberration Correction" in the "Lightroom Feature Requests" forum. You might consider posting your request there.
$$PhotoHobby

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

Chromatic Aberrations and ACR

I've read that Adobe Camera Raw (ACR) does a very good job of removing chromatic aberration artifacts.
I do believe that, but what specifically in ACR is the tools / sliders that will do this magic ?

It is great and a big time saver. Open a CR image in Camera Raw. On the right just below the histogram are 10 icons with a lens being the 6th from the left. Click on it, choose the Profile TAB, Select Enable Lens Profile Corrections, below in the Lens Profile select your Camera Make and if you are lucky your lens will be selectable in the Model pull down below. IF not Click on the manual tab and do it the old way. Also under the manual tab are some new geometric transforms that are sometimes useful at the Raw level. Enjoy!

Canon HF R400 Chromatic Aberration and Blocking Zooming, Hard Time Focusing, LCD Display GUI

An otherwise nice cam for the price point especially end-of-the model year. I'm going to keep for primarily shooting youtube collectibles in a controlled environment of clamp lights with diffusers and either Auto White Balance or 'P' mode.
1. In my optical zoom tests (it's nice there's four speed options. I use number 3. The cam exhibits a lot of chromatic aberration which is purple, white ,or even green fringing around the subject matter. I shot of a telephone pole transformer box in bright light, the sky behind it, tree branches and snow on hedges in winter.
2. On a couple occasions when I zoomed in from about estimated 100-150yds the sky exhibited large blocky pixels for a second. But if I took it to an amusement park to shoot roller coasters I'd hold my breath for both reasons.
3. It has a hard time adjusting focus when zoomed in even from a close 1-6ft distance to record detail of collectibles or leaves on bushes etc.
4. The amount of display items on the LCD GUI is too much. Even the cheap Samsung F90 has a button to turn it off. Am I missing something. I read the 197pg PDF manual. Is there a way to turn off or at least reduce the number of items I don't need to see in order to actually shoot a video/picture? In still life tests. I had to take photos with the cam. Look at them. Then adjust. Then repeat. Just to see the composition. Kind of like in the day when pro photographers would take Polaroids prior to the film shot.
Note: If I'm allow to post youtube links or at least the titles of the videos to demonstrate in the near future when I upload examples of the Likes and Dislikes of my purchase I'd like to know from a Canon moderator (thanx in advance).

Hi ElectroT2!
Thanks for posting.
Chromatic aberration is not always something that can be completely eliminated. It most often appears when shooting a subject in the foreground that highly contrasts with the background Chromatic aberration is caused by a lens having a different refractive index for different wavelengths of light. Because each hue in the spectrum is not focused at a single point, colored halos or fringing appears. There are two types of chromatic aberration: longitudinal, where different wavelengths are focused at different distances from the lens, and lateral, where different wavelengths are focused at different positions on the focal plane.
Are you zooming optically or digitally when you see the "blockiness" in the image? If digital zoom is being used, it would explain why you see it. Digital zoom appears as the light blue area of the zoom bar. When you zoom digitally, the image is basically cropped and expanded more and more as you zoom. Because of this, the image quality will deteriorate the more you zoom in. You can select the type of zoom used in the settings menu under [Zoom Type].
Autofocus may not work well on the following subjects:
- Reflective surfaces
- Subjects with low contrast or without vertical lines
- Fast moving subjects
- Through wet windows
- Night scenes
You can always adjust the focus manually by selecting [ Focus] in the menu. You can then touch a subject that appears inside the frame, then touch and hold to adjust focus. When it is focused where you want it, then touch [ X ] to lock the focus. Something that may help you is when you are focusing manually, you can touch inside the frame to automatically focus on that spot to help you with the adjustment process.
As for the onscreen displays you are describing, they cannot be disabled so that only the subject appears on the LCD. You can, however, keep them from being displayed when the camcorder is connected to an external monitor. The setting is in the menu under the tab. It is called [Output Onscreen Displays].
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Applying Chromatic Aberration to a image ?

I want to apply a small amount of Chromatic aberration to a Image. The Lens Correction Filter doesn't offer me the slightest results, unless I have to choose a specific camera for the image. I don't know what type of camera was used on the image?

Are you looking at things near the edges of the image? Are you expecting more than a few pixels worth of CA?
Here's something you can try that would give you both more control and as much CA as you want:
1. Make sure you're on an image layer, and Edit - Select All.
2. Make your CHANNELS panel visible.
3. Click on the Red channel to make it active.
4. Edit - Free Transform, make the W[idth] and H[eight] both 101% and complete the transform (press the checkmark).
5. Filter - Blur - Radial Blur, Amount 3, Zoom, Best.
6. Click on the Blue channel to make it active.
7. Edit - Free Transform, make the W[idth] and H[eight] both 99% and complete the transform.
8. Filter - Blur - Radial Blur, Amount 3, Zoom, Best.
9. Click on the RGB entry in the CHANNELS panel to see the result in full color.
Season the amounts to taste.
-Noel

Lens correction and chromatic fringe - broken in CS5 ?

Hello, chromatic aberration correction has changed since CS3.
It's limited to ONE pixel correction, or what ? It seems i cant get strong cyan/red bands anymore, i used it as an artistic effect and i need it back. Any way to have it behave like before? I'm not interested in manual workflow (moving manually RGB channels), thanks.
Paolo

It definitely seems different between cs3 and cs5.
I don't believe there is a way to get the same effect in cs5's Filter>Lens Correction and it's
not broken just improved i guess.
You might try a pixel bender filter called Convergence (ships with pixel bender plugin) or Color Separation Effect
http://www.adobe.com/cfusion/exchange/index.cfm?event=extensionDetail&loc=en_us&extid=2422 029
You would need to install the pixel bender plugin into photoshop cs5 from the bottom left of this page to use the above filters:
(Archived downloads)
http://www.adobe.com/devnet/pixelbender.html

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.

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

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.

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

? 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).

New Chromatic Aberration tools kills old settings.

I've just recently found that new chromatic aberration tools kills settings for old chromatic aberration tools.
Lets say I have a PV2010 photo with adjusted sliders for chromatic aberration reduction and selected defringe "all edges".
Now I'm importing this photo to LR 4.1.
Note: I'm not updating process version!
Photo is automatically updated by Lightroom to new CA controls (note it still PV2010 photo).
Well, I must say the the results are superb - they are the same as I was achieving with manual sliders, but now with only one click.
But the problem is - Lightroom says that metadata have been changed, and I am writing back changes to XMP.
But now XMP contains settings for new CA tools, but settings for old CA tools are LOST.
So if I want to open this image in ACR 6.6, or send it to someone with older LR version I end up with completely resetted CA settings, because ACR 6.6 does not have new CA tools, and settings for old tools are killed by LR 4.1 - they are just removed from XMP.
So I am loosing CA removal settings completely when opening image in earlier version of application.
And I am NOT updating process version!
Any comments on this?

Here is screen shot in which you can see that even PV2010 photo has new CA tools and old ones are gone with their settings applied in LR3.
I have tried to import CR2 files without any settings in the XMP into newly created empty catalog and have same result.
When I am switching photo to PV2003 or PV2010 only new CA tools are available.
And saving metadata to file kills old CA settings and writes settings for new tools (even for PV2010 photo) which previous versions does not understand.
To my opinion this is very serious bug!
Here is photoshop feedback message created 5 days ago: http://feedback.photoshop.com/photoshop_family/topics/lightroom_new_cromatic_aberration_to ols_kills_old_settings
Looks like noone cares...
Can someone at least say do I am the only person having this issue, or you can see this behaviour too.

Chroma Blur and Chromatic Aberration

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