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LR 4.1 RC: Remove CA reduces in some areas and increases in others?

Apr 3, 2012 3:56 PM

  Latest reply: trshaner, Apr 28, 2012 7:16 AM
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    Apr 28, 2012 6:37 AM   in reply to Susan S.

    Susan S. wrote:


    I've just hit a fringing torture test with a row of saxophone players, so  saxes behind (massive green fringing) and in front (red fringing) of the focal point, all bright polished brass, very high contrast lighting; with a drum kit behind with greenish cymbals and red drums, so I had to be really careful not to affect the drum kit colours or skin tones. The eyedropper totally failed on that, but fiddling with the sliders, holding the option key down to show on screen what is being included as you slide worked pretty well.

    There are Local defringe controls in the Adjustment Brush and Graduated Filter tools that may help. This allows you to adjust the CA amount in specific problem areas. Here's the suggested workflow:


    1. Do overall color and tone corrections first (e.g., Basic panel, Tone Curve panel, etc.).
    2. Turn on profile-based lens corrections (for distortion and vignetting), if needed.
    3. Turn on lateral CA correction (check the “Remove Chromatic Aberration” box), if needed.
    4. Apply global Defringe, if needed.
    5. Apply local Defringe, if needed.

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    Apr 28, 2012 6:38 AM   in reply to trshaner

    Can you apply negative defringing to remove it from certain areas?

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    Apr 28, 2012 6:51 AM   in reply to trshaner

    Oh, that's neat. I read (too quickly!) the bit on the Adobe blog, and figured out how to use the global controls, but missed the defringing in the adjustment brush. It looks like the best way is to globally defringe and then use the negative adjustment brush defringing to remove it from areas it is mucking up. Local defringing with positive settings is a bit less clear to me in its effect, reading the blog:- "Note that local +Defringe will remove fringes of all colors (not just purple and green) and hence is independent of the global Purple Hue and Green Hue settings." - does this mean it's like the original defringe control in LR3/4.0 then, only with a volume control?


    I must say this new defringing feature is worth the price of upgrade on its own. 

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    Apr 28, 2012 7:16 AM   in reply to Susan S.

    Eric says when you use a positive local Defringe setting it removes all colors, not just what you have set with the Global controls. On some of the images I tested the local Defringe tool(s) worked very well with a positive setting to remove the fringing that remained after using the global 'Remove Chromatic Aberration' and Defringe tools. This may, or may not work, depending on the specific type of CA issue you're dealing with.

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