Purple Fringing, how to prevent during shoot or reduce in CS3?


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psccy

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Sep 21, 2005
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#1
Hi guys...

Trying out shooting some stills over the weekend.

Had some issue with purple fringing with my A100.

A100, Minolta 75-200mm @ 135mm, F/11, 1.6sec, ISO100

How can I prevent it during the shooting process?
How can it reduce of remove it during postprocessing in CS3?
 

Rashkae

Senior Member
Nov 28, 2005
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#2
To prevent it: shoot at smaller apertures or buy better lenses

To remove it: Look in the "digital darkroom" forum category, there are detailed steps and pre-made anti-CA filter plugins available.
 

Jul 19, 2007
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#3
i think rashkae mostly told u how to prevent it. try going to photozone.de to find out abt CAs on ur lens. can be reduced by stopping down the aperture, and also by using certain focal lengths, the CAs will be less
(cant find the review for ur lens, but there will be reviews for other lenses)

in photoshop, try going to filters, distorts and then lens correction. there will be an option to remove fringing (by colouring it a contrasting colour). never tried it before, but i think it shld work

however the 1st point is not true for all lenses, e.g.: http://www.photozone.de/8Reviews/lenses/nikkor_80200_28/index.htm
the CAs are worse towards f/8 and the extreme focal lengths, 80mm and 200mm for the nikon 80-200 f/2.8 (scroll down to almost the bottom for a chart)
 

Rashkae

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Nov 28, 2005
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#4

boredphuck

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Aug 24, 2007
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Sengkang
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#5
If u shot in RAW, then when using Adobe Camera Raw, there is an option to remove or at least reduce fringing and vignetting.
 

psccy

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Sep 21, 2005
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#6
Thanks everyone!

When you mentioned to step down the aperture, does that mean I need to go from F/11 to F/22 or to F/8?
 

IONSOON

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Feb 4, 2007
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Clementi
#8
Thanks everyone!

When you mentioned to step down the aperture, does that mean I need to go from F/11 to F/22 or to F/8?
go from F11 to smaller aperture means the number must be greater than F11, such as F16 or F22. but also dun go too small as diffraction may occurs
 

IONSOON

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Feb 4, 2007
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Clementi
#9
OT abit, is that purple fringing considered as chromatic aberrations?
 

#10
yes i believe.

under postprocessing in raw window u can go to lens correction, adjust the hues of the colours u want but it will be quite minimal only..

i had a shot with fringing and i converted to b&w..tada...fringing gone and u get a nice sharp picture haha but of course its subjective to what picture suits a black and white more la ;p
 

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