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Thread: Where is magenta the coming from?

  1. #1
    Alis's Avatar
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    Where is magenta the coming from?

    This is shot under mid day sunlight at the pool (so his hair is wet, but this happens even when it is not wet ):

    Where is magenta the coming from?

    His hair has magenta colored patches here and there that is not there in real world I have noticed this on a few other pictures, all under harsh sunlight.

    I was wondering if anyone can explain why this happens. And what the best way is to get rid of it (I mean in PP).

    Thanks!

  2. #2
    arith's Avatar
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    Re: Where the magenta is coming from?

    I doubt if it is this but the lens could be at fault I suppose Alis. Purple Fringing.

    http://en.wikipedia.org/wiki/Purple_fringing

  3. #3
    Shadowman's Avatar
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    Re: Where the magenta is coming from?

    Photoshop should be able to get rid of the purple tinge. Just use the replace color function and use the black hair as the replacement hue.

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    Re: Where the magenta is coming from?

    Could your camera have a slight sensitivity to infrared ? The magenta seems to be part pf the bright sheen of the Sun light reflecting off the hair, which can be strong in IR.

    I know many cameras that are used for or converted to infrared photography capture images which are very strongly magenta.

  5. #5
    Alis's Avatar
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    Re: Where the magenta is coming from?

    Quote Originally Posted by arith View Post
    I doubt if it is this but the lens could be at fault I suppose Alis. Purple Fringing.
    Possible, but shouldn't be more general and not localized like this?

  6. #6
    Alis's Avatar
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    Re: Where the magenta is coming from?

    Quote Originally Posted by Shadowman View Post
    Photoshop should be able to get rid of the purple tinge. Just use the replace color function and use the black hair as the replacement hue.
    Thanks, but by solution I meant something more global if this is a global problem. Honestly, I do not like those tricks , I do them myself very often, move things, clone stuff, change colors, etc, but I like to know what the cause of it is so that I can get it right in the camera.

  7. #7
    Moderator Dave Humphries's Avatar
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    Re: Where the magenta is coming from?

    Diagnostic questions:

    a) Is it visible in the optical viewfinder? (I doubt it)
    b) Is it visible on Live View? (possibly, you may need to magnify to see it though, and shade the LCD)
    c) If you set up a pose displaying the problem, if you then shade half his hair from sunlight, does it go away on that half? (I expect so)
    d) Is it only/most visible with backlighting like this (I suspect so)
    e) How does it respond to a polarising filter (I'm just interested )
    f) Does it occur only at some camera to subject distances? (possibly)
    g) Does he use his Mom's shine enhancing shampoo? (because she's worth it )
    h) What's causing it? (I haven't the foggiest )

    OK, the last one isn't strictly true, I'd say some kind of refraction (and it may have an IR element to it)

    Polarising filter might fix it in camera

    Cheers,

  8. #8
    Alis's Avatar
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    Re: Where the magenta is coming from?

    Quote Originally Posted by Steaphany View Post
    Could your camera have a slight sensitivity to infrared ? The magenta seems to be part pf the bright sheen of the Sun light reflecting off the hair, which can be strong in IR.

    I know many cameras that are used for or converted to infrared photography capture images which are very strongly magenta.
    Thanks, Steaphany,

    Mine is not a IR camera. Actually, I am very interested to know how I can take those pictures. Have not had the time to read about it yet

  9. #9
    timo2's Avatar
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    Re: Where the magenta is coming from?

    What camera? (c)

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    Re: Where the magenta is coming from?

    A simple solution...................

    If you're trying to reduce the output of a particular color, go to you're hue and saturation adjustments---change to the color you want to get rid of-----increase the saturation to 100% and you will see where the color is in the photo. If it doesn't affect anything else, simple desaturate it. In your photo, the magenta is only on his hair --a little at the base of the wall--and a touch on his arm.

  11. #11

    Re: Where the magenta is coming from?

    I had one image that ACR 5.x made the horse mane purple!
    By using a different RAW converter it was OK, also ACR 6 was ok.

  12. #12
    Alis's Avatar
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    Re: Where the magenta is coming from?

    Quote Originally Posted by Pictus View Post
    I had one image that ACR 5.x made the horse mane purple!
    By using a different RAW converter it was OK, also ACR 6 was ok.
    Interesting, Pictus. This means it is an artifact caused by the software.

  13. #13
    Alis's Avatar
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    Re: Where the magenta is coming from?

    Quote Originally Posted by Steve S View Post
    A simple solution...................

    If you're trying to reduce the output of a particular color, go to you're hue and saturation adjustments---change to the color you want to get rid of-----increase the saturation to 100% and you will see where the color is in the photo. If it doesn't affect anything else, simple desaturate it. In your photo, the magenta is only on his hair --a little at the base of the wall--and a touch on his arm.

    Thanks, Steve. Excellent tip!

  14. #14
    Alis's Avatar
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    Re: Where the magenta is coming from?

    Quote Originally Posted by timo2 View Post
    What camera? (c)
    Hi Tim,

    I use a Canon 5D MKII.

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