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Purple Fringe Killer?

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    Jestertheclown
    24 May 2012 - 3:02 PM

    Someone linked to this in a forum thread about chromatic aberration on the "Cambridge in Colour" site.
    Apparently it's a photoshop plug-in which erm, kills purple fringing.

    It's not something that I encounter a great deal and mostly, I can dial it out using Photoshop but this is supposed to be really effective.

    I've downloaded it but as yet, it's still sitting in its folder.

    Has anyone heard of it before? Or used it?

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    JJGEE
    JJGEE  96276 forum posts England18 Constructive Critique Points
    24 May 2012 - 3:12 PM

    Are you not a Lightroom user ?

    LR 4.1 RC2 is your friend Wink

    To find out more read Eric Chan's excellent blog on the subject.

    Jestertheclown
    24 May 2012 - 3:34 PM


    Quote: Are you not a Lightroom user ?


    Lightroom 3.5, yes.

    It was really just a general question to see what it's all about.

    teepee
    teepee  11650 forum posts England
    24 May 2012 - 4:57 PM

    send me the link for the download please.............tony

    GlennH
    GlennH  91918 forum posts France1 Constructive Critique Points
    24 May 2012 - 5:32 PM


    Quote: To find out more read Eric Chan's excellent blog on the subject.

    That's one of the more useful links I've ever seen - thanks! Downloading 4.1RC without further ado.

    Axial CA is nothing short of a b'stard to deal with ordinarily, and especially in fast lenses where it's extremely pronounced at wide apertures.

    I think Nikon users already had proprietary software that addressed this - might encourage me to fish out the Sigma 50mm f1.4 more often!

    Jestertheclown
    24 May 2012 - 5:37 PM


    Quote: send me the link for the download please.............tony


    I can't find it Tony!

    Google perhaps?

    GlennH
    GlennH  91918 forum posts France1 Constructive Critique Points
    24 May 2012 - 5:40 PM

    Link.

    teepee
    teepee  11650 forum posts England
    24 May 2012 - 10:30 PM

    cheers mate........do you know if this plug in works with CS5?Smile

    Last Modified By teepee at 24 May 2012 - 10:35 PM
    Jestertheclown
    24 May 2012 - 10:59 PM


    Quote: do you know if this plug in works with CS5?Smile


    I fear we may be at crossed purposes here Tony.
    The link above takes you to a download of a version of Lightroom which isn't a plug in.
    The plug in that I was referring to is the Purple fringe thing that I still haven't erm, plugged in and which I can't find the link to.

    GlennH
    GlennH  91918 forum posts France1 Constructive Critique Points
    25 May 2012 - 6:59 AM


    Quote: do you know if this plug in works with CS5?SmileThe plug in that I was referring to is the Purple fringe thing that I still haven't erm, plugged in and which I can't find the link to.

    The problem being that purple (often accompanied by green) fringing is typically associated with axial chromatic aberration, whereas every app or piece of software to date save for Nikon's Capture NX2 has dealt solely with lateral chromatic aberration—which produces red and cyan fringing.

    One of the reasons why axial CA is difficult to handle is because it permeates the whole image - doesn't restrict itself to the outer boundaries, so making specific corrections without affecting the healthy areas is difficult. It's a sickness that particularly affects fast lenses, with the ironic solution being to close down the aperture—somewhat defeating the purpose of owning a fast lens in the first place.

    If you look at the ugly mutt below you'll see a total front-to-back example of what I think is axial (aka longitudinal) CA, shot on a fast 50mm lens. This new development from Adobe will be welcome by many, and particularly as modern high-res cameras tend to accentuate the problem. I guess the same facility will follow in ACR CS6.

    magenta-green.jpg

    joolsb
    joolsb  927115 forum posts Switzerland38 Constructive Critique Points
    25 May 2012 - 7:08 AM

    Purple fringe killer?

    Well, you could use a pair of scissors or just wait for it to grow out.

    Generally, though, it's never a good idea to go to the hairdresser's after you've had a few. Smile

    Jestertheclown
    25 May 2012 - 7:28 AM


    Quote: Generally, though, it's never a good idea to go to the hairdresser's after you've had a few. Smile

    . . . you've done it as well then?

    GlennH
    GlennH  91918 forum posts France1 Constructive Critique Points
    25 May 2012 - 7:30 AM

    If this were a childish forum there'd be someone working on Jools' profile picture right now...

    joolsb
    joolsb  927115 forum posts Switzerland38 Constructive Critique Points
    25 May 2012 - 12:55 PM

    Tongue Smile

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