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ACR 6.7 Colour litter

May 13, 2012 12:40 AM

I have two snippets of a photo taken as RAW format and as JPG.

The photo taken in Raw format shows colour litter. green tint on the right side of objects and red tint on the left side while in the JPG file everything is OK.

Does that have to do with ACR or is it a camera flaw? I am using Nikon D800.

RAWbloop_36.jpg

 

JPG bloop_37.jpg

 
Replies
  • Currently Being Moderated
    May 13, 2012 1:26 AM   in reply to Eireannsg1

    That's called CA or Chromatic Aberration, caused by the lens.

     

    The JPEG generated in camera has the Nikon profile for that particular lens already applied to the image in order to correct the CA.  The same CA correction is applied by the Nikon software, so the Color Aberration fringing is corrected.

     

    As has been explained earlier, Camera Raw does not apply any such correction unless you yourself have installed the specific profile for that particular lens and direct Camera Raw to apply the profile correction to your image.

     

    What you are seeing is normal and expected.

     
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  • Currently Being Moderated
    May 13, 2012 7:14 AM   in reply to Eireannsg1

    So did you turn on CA removal or not?

     
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  • Currently Being Moderated
    May 13, 2012 8:17 AM   in reply to Eireannsg1

    I'm also curious to know whether you instructed Camera Raw to apply CA Correction or not.

     

    Personally, I absolutely blame the lens. 

     
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  • Currently Being Moderated
    May 13, 2012 8:31 AM   in reply to Eireannsg1

    It's lateral chromatic aberration (complimentary colours on each side of high contrast objects towards the edge of the photo). You need to switch on Chromatic Aberration Correction in the Lens Corrections tab. I have it set on by default (Save New Camera Raw Defaults).

     

    It's not handled by Lens Profiles any more, since 6.7RC, it's done automatically in software, on an image-by-image basis. Hallelujah.

     

    If it's already switched on, then you have a problem lens, or CR is confused, but it's not switched on by default, IIRC, so it's worth checking.

     
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  • Currently Being Moderated
    May 13, 2012 8:33 AM   in reply to Yammer P

    Yammer P wrote:

     

    …Chromatic Aberration Correction…

     

    It's not handled by Lens Profiles any more, since 6.7RC, it's done automatically in software, on an image-by-image basis…

     

    Thanks for that very pertinent clarification.

     
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  • Noel Carboni
    21,318 posts
    Dec 23, 2006
    Currently Being Moderated
    May 13, 2012 5:22 PM   in reply to Eireannsg1

    There's an open thread in which we have been discussing that the latest implementation of CA correction isn't as effective as its predecessor.

     

    http://forums.adobe.com/thread/1002680?tstart=0

     

    -Noel

     
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  • Currently Being Moderated
    May 13, 2012 11:33 PM   in reply to Eireannsg1

    Regardless of what DxO says, I have 6 Nikon lenses, with my 24-70mm being by far the most expensive and highly-regarded. Despite that, it consistently gave the one of the worst CA-corrected performances of them all in ACR6 versions prior to 6.7, with significant fine-tuning being required in most cases. Now, in ACR 6.7 it is MUCH better.

     

    According to Adobe employees in this forum, the problem may have been due to manufacturing tolerances (i.e. my copy is quite different to Adobe's copy) but this seems hard to swallow when it's such a top-end lens. Anyway, I'm very happy now.

     

    And, just to clarify, the new setting's Default is Off. If you want it On, you have to set it yourself. Old CA adjustment values are deleted from XMP.

     
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  • Currently Being Moderated
    May 14, 2012 7:35 AM   in reply to Eireannsg1

    Eireannsg1 wrote:

     

    Yammer P: Versions before 6.7 didnt have any D800 support. So here we cant say that the 6.7 version is much better than previous versions.

    True, but I don't think the camera has much impact on raw chromatic aberration (if any). It's more of a function of the lens optics and the sensor dimensions.

     
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