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04/21/2008 08:43:46 AM · #1 |
Recently I've noticed some purple spots on some of my pictures. It's only on highly reflective surfaces (water, snow) but sometimes it doesn't happen at all. It is happening with different lenses so the problem is not the lens. It appears in different parts of the photos so I imagine that means it's not a spot on the sensor causing this, right?
Here's an example of what I mean...
I've had purple fringing happen before when photographing black dogs against the blue sky, but this doesn't look quite like that (although maybe that is what it is?)
What's causing this? How can I prevent it? I'm shooting in RAW if that is relevant.
Thanks.
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04/21/2008 08:52:45 AM · #2 |
| Even with the arrow I can't see it. Maybe a 100% crop of the area would help (or even 50%)? |
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04/21/2008 08:58:38 AM · #3 |
| It does seem to have the characteristic color of purple fringing. I'd guess that is what it is. |
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04/21/2008 09:06:59 AM · #4 |
Originally posted by glad2badad:
Even with the arrow I can't see it. Maybe a 100% crop of the area would help (or even 50%)? |
Hmmmm. Even if you click the thumbnail to see the larger image? Here's a crop of just that spot...hopefully this will show it better.
www.westwindonline.ca/images/20080414_b0979.jpg |
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04/21/2008 09:15:03 AM · #5 |
Originally posted by BlackNewfs:
Originally posted by glad2badad:
Even with the arrow I can't see it. Maybe a 100% crop of the area would help (or even 50%)? |
Hmmmm. Even if you click the thumbnail to see the larger image? Here's a crop of just that spot...hopefully this will show it better.
www.westwindonline.ca/images/20080414_b0979.jpg |
That's better. :-) Although I still don't see much in the way of purple fringing except for the very small highlights in the water near the OOF twig.
As for when this happens, I thought extremely high contrast situations (like the water and snow you mention) are the most likely scenarios for it to show up. ??? That's just from what I've read about it... |
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04/21/2008 09:27:21 AM · #6 |
Originally posted by glad2badad:
That's better. :-) Although I still don't see much in the way of purple fringing except for the very small highlights in the water near the OOF twig.
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Yes, that's what I'm talking about, those horribly distracting purple reflections. Funny you say "Very small" since that's all I see when I look at this photo - purple spots through the water.
So it is chromatic aberration then? I know I can get rid of it in PS, but how do I prevent it in the first place? |
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04/21/2008 09:38:29 AM · #7 |
Originally posted by BlackNewfs:
... So it is chromatic aberration then? I know I can get rid of it in PS, but how do I prevent it in the first place? |
Sounds like it, but again, I only understand it from the little I've read about it. I've only seen it personally in very high contrast scenes. From what I've read chromatic aberration is usually lens related, and purple fringing can be lens or sensor related.
Here's an article on it at dpreview.com: Chromatic Aberration |
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