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11-02-2013, 10:24 AM   #1
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What are these artifacts?

Hi forum users,

Shooting with my K5 IIs, I see these frequently on hair (real or artificial). Seems like it happens when parts of the hair get over exposed. What are these? Is this what is known as blooming? Is there a way to avoid this?

100% crop


11-02-2013, 10:37 AM   #2
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Looks like over sharpening to me... I have seen so many people setting their DSLR cameras with 'hard' sharpening as default.
11-02-2013, 10:54 AM   #3
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QuoteOriginally posted by aleonx3 Quote
Looks like over sharpening to me... I have seen so many people setting their DSLR cameras with 'hard' sharpening as default.
No, these are developed from RAW using Aperture 3.4 with no sharpening applied. The OOC jpeg in the camera preview also shows the same.
11-02-2013, 10:59 AM   #4
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What lens were you using? It looks to me like purple fringing on blown highlights.

11-02-2013, 11:05 AM   #5
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QuoteOriginally posted by Parallax Quote
What lens were you using? It looks to me like purple fringing on blown highlights.
Seen those before myself, and I agree, looks like PF on blown highlights. However, my first thought was "Jim! You need to invest in a Sonicare toothbrush!" Otherwise, you're looking great....for your age!

Regards!
11-02-2013, 11:13 AM   #6
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I used the FA77 @ f/3.2

11-02-2013, 12:09 PM   #7
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QuoteOriginally posted by Parallax Quote
It looks to me like purple fringing on blown highlights.
What he said. The FA 77 can produce purple fringing with some subjects. It can often be removed in post-processing.


Steve
11-02-2013, 12:49 PM   #8
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QuoteOriginally posted by Rupert Quote
.....my first thought was "Jim! You need to invest in a Sonicare toothbrush!" Otherwise, you're looking great....for your age!

Regards!
Funny, my first thought was "Never mind the hair, tell us how his foot is healing."

11-02-2013, 02:49 PM   #9
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If that's a wig with a halloween costume and not natural hair, I'd say it's refraction caused by the reflections of synthetic hair and probably a flash used. No telling what color reflections you'll get with fake nylon hair...if that's the case it has nothing to do with the lens, it's the reflective properties of the synthetic hair. In other words, prism effect.
11-02-2013, 05:45 PM   #10
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Thanks

Thanks for all the responses. I have seen this on real hair too. It was in bright daylight outside, no flash used. I will try the same experiment with the DA70 and see what happens.
11-02-2013, 06:14 PM   #11
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Lens is showing purple fringe on high contrast areas.

You can see it also in the nose wrinkles and other areas of the face if you zoom in.

Should be fixable in post processing.
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11-03-2013, 01:38 AM   #12
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Hi

None of the above, a bad case of dandruff I suspect.
11-03-2013, 03:39 AM   #13
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QuoteOriginally posted by Paleo Pete Quote
If that's a wig with a halloween costume and not natural hair, I'd say it's refraction caused by the reflections of synthetic hair and probably a flash used. No telling what color reflections you'll get with fake nylon hair...if that's the case it has nothing to do with the lens, it's the reflective properties of the synthetic hair. In other words, prism effect.
I've often noticed unexpected colors in the highlights of synthetic hair used on dolls, costume masks and the like. Definitely a property of the material being used.
11-03-2013, 09:52 AM   #14
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QuoteOriginally posted by Paleo Pete Quote
it's the reflective properties of the synthetic hair. In other words, prism effect.
Excellent alternate hypothesis.


Steve

(...for the record, I have only had significant purple fringing with my FA 77/1.8 on one occasion. I guess I just know how to pick my subjects )
11-03-2013, 10:28 AM   #15
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Happens with real hair too

Well, I have seen this happen with real people and real hair too. It always happens to hair when highlights are blown. I am away from home today, but I will and post some samples later.
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