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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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 Posted: Sun Mar 18, 2007 10:31 pm Post subject: Purple flar on picture |
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Attila wrote:
Is anybody know why this purple flair comes on this picture. It is taken by Vivitar Series 1 70-210mm f/3 by one of our Hungarian forum member.
http://www.acws.hu/LGA_0071.JPG
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Jigt
Joined: 16 Mar 2007
Posts: 412
Location: Belgium
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| Posted: Sun Mar 18, 2007 10:49 pm Post subject: |
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Jigt wrote:
If you Google with Purple fringing you might get some answers.
Has to to do with crhomatic aberation.
Guido |
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
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| Posted: Sun Mar 18, 2007 10:52 pm Post subject: |
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Attila wrote:
Many thanks Guido!
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peterqd
Joined: 28 Feb 2007
Posts: 7448
Location: near High Wycombe, UK
Expire: 2014-01-04
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| Posted: Sun Mar 18, 2007 11:21 pm Post subject: |
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peterqd wrote:
This is the best explanation I know of:
http://en.wikipedia.org/wiki/Chromatic_aberration |
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
Expire: 2012-12-04
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| Posted: Sun Mar 18, 2007 11:26 pm Post subject: |
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Orio wrote:
This is a combination of flare + chromatic aberration.
Unfortunately, it is very difficult to get rid of even in Photoshop. This because the CA filters look for neat borders. The flare acts on the CA like the flat side of a knife on the butter.
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Sun Mar 18, 2007 11:30 pm Post subject: |
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Attila wrote:
I found in Wikipedia how to avoid, this is photographer mistake mostly. Easy to handle it.
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
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| Posted: Sun Mar 18, 2007 11:33 pm Post subject: |
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Orio wrote:
| Attila wrote: |
| I found in Wikipedia how to avoid, this is photographer mistake mostly. Easy to handle it. |
Processing can remove the CA, but not the glow caused by such a strong flare, unfortunately.
The best advice to give is to always shoot with the hood on. This will minimize the flare. It will do nothing for the CA, but once isolated from the flare influence, the CA will be much easier to remove in Photoshop.
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vilva
Joined: 04 Mar 2007
Posts: 785
Location: Porvoo/Borgå, Finland
Expire: 2015-05-27
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| Posted: Mon Mar 19, 2007 3:10 am Post subject: Purple flar on picture |
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vilva wrote:
Instead of the "normal" chromatic aberration, it more probably is blooming near positions of strong overexposure, see http://www.dpreview.com/learn/?/Glossary/Digital_Imaging/Blooming_01.htm, perhaps in combination with microlens level chromatic aberration, see "purple fringing" at the end of
http://www.dpreview.com/learn/?/key=chromatic+aberration
Veijo |
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Mon Mar 19, 2007 8:09 am Post subject: |
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Attila wrote:
Thank you!
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