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S
steve_s1962
Participant
May 21, 2018
Answered

Lens correction

  • May 21, 2018
  • 3 replies
  • 512 views

Hi there apologies if this has already been covered.

I recently took some images with my Canon 7D mk 11 with a 18~135mm 3.5-5.6IS STM attached. The images were of a thatched cottage against a blue sky.  When I opened the images I noticed really obvious purple fringing along where the roof line against the sky and around the edges of the cottage.

I opened lens correction in PS CS6 to see if this would help reduce the issue. Under the "Auto Correction" pane search criteria there is a drop down menu to select camera make, model and lens.  Canon is obviously supported as was my STM lens, however under the camera model only the older 7D is listed.  I am led to understand that Adobe list the 7D mk 11 as being supported. Can anyone suggest how I can include my 7D mk11 into the Auto Correction search criteria pane please.

Also is this purple fringing or CA a particular problem with this lens?

Many thanks

S

    This topic has been closed for replies.
    Correct answer D Fosse

    Yes, this is CA and lens profiles won't help. It needs separate correction.

    There are two types of CA. Lateral CA causes colored fringing towards the edges of the frame. This is removed with the checkbox in ACR.

    Another type is axial CA, which causes green or magenta fringing in out-of-focus transitions (color depending on whether it's in front of the focus plane or behind it). This can't be automatically removed and has to be done manually.

    3 replies

    D Fosse
    Community Expert
    D FosseCommunity ExpertCorrect answer
    Community Expert
    May 22, 2018

    Yes, this is CA and lens profiles won't help. It needs separate correction.

    There are two types of CA. Lateral CA causes colored fringing towards the edges of the frame. This is removed with the checkbox in ACR.

    Another type is axial CA, which causes green or magenta fringing in out-of-focus transitions (color depending on whether it's in front of the focus plane or behind it). This can't be automatically removed and has to be done manually.

    Theresa J
    Community Expert
    Theresa JCommunity Expert
    Community Expert
    May 22, 2018

    Did you capture the images in raw? What you are describing sounds like chromatic aberration. There is a setting in ACR and Lightroom in the lens correction panel to remove chromatic aberration. It works great on raw files. This should work even if you can’t find the correct lens profile. If you have jpegs, you can open them in ACR if you start from Bridge.

    You probably aren’t finding your lens listed because it may be newer than the CS6 version of Photoshop you are working with.

    S
    steve_s1962Author
    Participant
    May 25, 2018

    Hi

    Thanks for taking time to reply.  Yes I shot in RAW.  I appreciate your suggestions to resolve thank you.

    I was able to find the correct lens, it was my Canon 7D mk11 that wasn't listed.  The older 7D was listed.

      melissapiccone
      Community Expert
      melissapicconeCommunity Expert
      Community Expert
      May 21, 2018
      I can't help you directly with the specifics of your camera however I can tell you how to manually fix the fringing. Use a brush set to color mode, select the blue sky and paint over the purple parts so they match the background.
      Melissa Piccone | Adobe Trainer | Online Courses Author | Fine Artist
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