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Help with CA, paralax and Barrel Distortion

 
 
Rich Bail
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      01-06-2004, 01:45 AM
What are the best procedures to eliminate Barrel Distortion (or Pincushion
distortion), Chromatic Aberration and Parallax?


 
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Stephan
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      01-06-2004, 03:24 AM

"Rich Bail" <(E-Mail Removed)> wrote in message
news:HqoKb.39028$(E-Mail Removed) hlink.net...
> What are the best procedures to eliminate Barrel Distortion (or Pincushion
> distortion), Chromatic Aberration and Parallax?
>

Buying a proper lens would be the first one
Then there is a plugin (did I say plugin?) called LensDoc.
http://www.andromeda.com/info/lensdoc.html that takes care of most barrels
and pincushions.
It can also work out some parallax problems if not too acute.
Chromatic aberrations come in too many different variations.

Stephan


 
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Warren Sarle
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      01-06-2004, 05:49 AM
"Stephan" <(E-Mail Removed)> wrote in message
news:YTpKb.43143$(E-Mail Removed)...
>
> "Rich Bail" <(E-Mail Removed)> wrote in message
> news:HqoKb.39028$(E-Mail Removed) hlink.net...
> > What are the best procedures to eliminate Barrel Distortion (or

Pincushion
> > distortion), Chromatic Aberration and Parallax?


What do you mean by parallax? Traditionally, it refers to the fact the view
as seen through a non-TTL viewfinder is not the same as the image on film,
especially for close-ups, but there's not much you can do about that after
the fact.

> Buying a proper lens would be the first one


All lenses distort.

> Then there is a plugin (did I say plugin?) called LensDoc.
> http://www.andromeda.com/info/lensdoc.html that takes care of most barrels
> and pincushions.


Debarrelizer is much easier to use and cheaper:
http://www.theimagingfactory.com/

> Chromatic aberrations come in too many different variations.


Debarrelizer also helps with some common forms of chromatic aberration.
Other plug-ins can be found via Google.


 
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Robert Feinman
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      01-06-2004, 02:03 PM
In article <HqoKb.39028$(E-Mail Removed) k.net>,
(E-Mail Removed) says...
> What are the best procedures to eliminate Barrel Distortion (or Pincushion
> distortion), Chromatic Aberration and Parallax?
>
>
>

The free program panorama tools has plugins that will fix lens
distortions as well as alter perspective and point of view.
Do a google search to find a site currently hosting it.

--
Robert D Feinman
(E-Mail Removed)
Landscapes, Cityscapes, Panoramas and Photoshop Tips
http://robertdfeinman.com
 
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Glenn
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      01-06-2004, 04:27 PM
"Stephan" <(E-Mail Removed)> wrote in message
news:YTpKb.43143$(E-Mail Removed)...
>
> "Rich Bail" <(E-Mail Removed)> wrote in message
> news:HqoKb.39028$(E-Mail Removed) hlink.net...
> > What are the best procedures to eliminate Barrel Distortion (or

Pincushion
> > distortion), Chromatic Aberration and Parallax?
> >

> Buying a proper lens would be the first one


That is what I was thinking ... correct at the source of the problem.



> Then there is a plugin (did I say plugin?) called LensDoc.
> http://www.andromeda.com/info/lensdoc.html that takes care of most barrels
> and pincushions.
> It can also work out some parallax problems if not too acute.
> Chromatic aberrations come in too many different variations.
>
> Stephan
>
>



 
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Stephan
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      01-06-2004, 04:57 PM

"Warren Sarle" <(E-Mail Removed)> wrote in message
news:G%rKb.211419$(E-Mail Removed) .com...
> "Stephan" <(E-Mail Removed)> wrote in message
> news:YTpKb.43143$(E-Mail Removed)...
> >

> Debarrelizer also helps with some common forms of chromatic aberration.
> Other plug-ins can be found via Google.
>

How does Debarrelizer help with chromatic aberration??

Stephan


 
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Jim
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      01-06-2004, 07:12 PM
Yes, but some lenses distort much more than others.
"Warren Sarle" <(E-Mail Removed)> wrote in message
news:G%rKb.211419$(E-Mail Removed) .com...
> All lenses distort.



 
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Warren Sarle
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      01-07-2004, 01:31 AM
"Stephan" <(E-Mail Removed)> wrote in message
news:zNBKb.40440$(E-Mail Removed)...
>
> "Warren Sarle" <(E-Mail Removed)> wrote in message
> news:G%rKb.211419$(E-Mail Removed) .com...
> > "Stephan" <(E-Mail Removed)> wrote in message
> > news:YTpKb.43143$(E-Mail Removed)...
> > >

> > Debarrelizer also helps with some common forms of chromatic aberration.
> > Other plug-ins can be found via Google.
> >

> How does Debarrelizer help with chromatic aberration??


It can transform each channel separately.


 
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Florian
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      01-18-2004, 01:42 PM

Hi,

I recently wrote such a plugin, you'll find it at:

http://flofiltres.free.fr/UnDistort

It corrects pincushion/barrel distortions, lateral chromatic aberration and
perspective (I suppose that's what you're looking for). Unlike the free
Panorama Tools, it's a shareware.

Florian.


Rich Bail wrote:
>
> What are the best procedures to eliminate Barrel Distortion (or Pincushion
> distortion), Chromatic Aberration and Parallax?

 
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Florian
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      01-18-2004, 01:55 PM

Euh, that was an incorrect address. Here is the correct one:

http://flofilters.free.fr/UnDistort


Florian wrote:
>
> Hi,
>
> I recently wrote such a plugin, you'll find it at:
>
> http://flofiltres.free.fr/UnDistort
>
> It corrects pincushion/barrel distortions, lateral chromatic aberration and
> perspective (I suppose that's what you're looking for). Unlike the free
> Panorama Tools, it's a shareware.
>
> Florian.
>
> Rich Bail wrote:
> >
> > What are the best procedures to eliminate Barrel Distortion (or Pincushion
> > distortion), Chromatic Aberration and Parallax?

 
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