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ACR Chrom. Abberation vs. 'Lens Correction' CA



 
 
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  #1  
Old December 4th 05, 07:22 PM posted to rec.photo.digital
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Default ACR Chrom. Abberation vs. 'Lens Correction' CA

Using P'shop CS2, has anyone else noticed that using the 'Lens
Correction' red/cyan fringe correction is much less effective (not able
to achieve the same level of fringe reduction) than correcting CA 'on
the way in' with ACR?
Does anyone know why this would be the case?

W

  #2  
Old December 5th 05, 03:21 AM posted to rec.photo.digital
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Default ACR Chrom. Abberation vs. 'Lens Correction' CA

Its a matter of opinion.


  #3  
Old December 5th 05, 03:47 AM posted to rec.photo.digital
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Default ACR Chrom. Abberation vs. 'Lens Correction' CA

Not really a matter of opinion from what I have seen. ACR operation on
RAW files allows strong suppresion of CA (at least with 20D shots with
an EF 24mm f/2.8 lens) whereas when I used the 'Lens Correction' it did
not do nearly as well.

  #4  
Old December 5th 05, 05:18 PM posted to rec.photo.digital
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Default ACR Chrom. Abberation vs. 'Lens Correction' CA


"W (winhag)" wrote in message
oups.com...
Using P'shop CS2, has anyone else noticed that using the
'Lens Correction' red/cyan fringe correction is much less
effective (not able to achieve the same level of fringe reduction)
than correcting CA 'on the way in' with ACR?
Does anyone know why this would be the case?


Not sure wether it applies here, but ACR does many of its corrections
at Demosaicing time, or at Gamma 1.0 to selected colorspace conversion
time. That may introduce differences with applying those corrections
at e.g. Gamma 1/2.2 space.

Bart

 




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