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[OM] Olympus Viewer, ACR, highlights, distortion and vignetting [was Arr

Subject: [OM] Olympus Viewer, ACR, highlights, distortion and vignetting [was Arrrrgggghhhh. Need sleep.... need sleep.....],
From: usher99@xxxxxxx
Date: Wed, 6 Mar 2013 17:08:24 -0500 (EST)
>>Told ya. ;-) My data is based on direct, personal experimentation. 
There is
>>often a great deal of highlight data that
>>ACR can successfully recover, that just isn't there in Viewer2. I 
don't know if
>>you remember was back to the 5D review
>>in dpreview. They compared highlight recovery in DPP to ACR.
>><http://www.dpreview.com/reviews/canoneos5d/23>

Now that you point it out again I remember seeing that data.



>>If you want to see the difference, open an ORF in RawTherapee, or any 
other
>>converter that ignores, or may be set to
>>ignore, the lens data. Here's a very clear example of how ACR (as 
well as
>>Viewer2) uses the lens data to correct linear
>>distortion and vignetting.
>><http://www.moosemystic.net/Gallery/tech/Lenses/Misc/_1153848_lindistor
t.htm>

Yes, less misinformed than old data--didn't take too many months for 
Adobe to use the metadata it seems. I now recall that you said that ACR 
corrects to about 80 % which is about the same as for Canyon lenses but 
no slider adjustments are available. Last I checked the LCA correction 
metadata was only valid for Panny lenses on Panny bodies. Perhaps that 
is still true. I still see some use the supplemental profiles to 
correct the residual geometric distortion or still use PT lens. I see 
that the horizon you corrected with the metadata still has about 10-20% 
residual barrel distortion left as I analyze with my trusty straight 
edge. Enjoyed the roll-over.

Mike




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