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 :)):

http://i40.tinypic.com/am6rz8.jpg

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!

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

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.

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.

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Originally Posted by arith

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

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Possible, but shouldn't be more general and not localized like this?

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Originally Posted by Shadowman

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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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.

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 :D )
h) What's causing it? (I haven't the foggiest :rolleyes: )

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,

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Originally Posted by Steaphany

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.

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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 :)

What camera? (c)

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.

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

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Originally Posted by Pictus

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

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Interesting, Pictus. This means it is an artifact caused by the software.

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Originally Posted by Steve S

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.

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Thanks, Steve. Excellent tip!

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Originally Posted by timo2

What camera? (c)

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Hi Tim,

I use a Canon 5D MKII.