Digital BW, The Print

Had to do some internal architectural shoots a couple of weeks ago 
that necessitated the nasty end of some wide angle lenses.  I can 
cope with correcting converting verticals but I have not found a 
method to correct pincushion distortion in Photoshop.  I know I'm not 
really in the right forum for this question but if I promise to use 
my VM set will someone pllllease help me out....

Thanks ;-)

Steve

> I can cope with correcting converting verticals but I have not found a 
> method to correct pincushion distortion in Photoshop.
> Steve

Steve,

There is a action to fix barrel/pincushioning distortion in Photoshop. The link below 
is for correcting barrel distortion before an image is stitched together for a 
panorama. The action is only specific for the Nikon 5700 but can be modified for 
any lens. The action is only a screen shot of the menu but is easy to make in 
Photoshop and then modify from there.

Go to the bottom of the page: Correcting Barrel Disortion in Photoshop

http://www.JudyArndt.ca/pan5700/pan5700.htm

Best,

John V.

Hi John,

There are a couple of commercial plugins for photoshop that will take care of pincusion etc as well as perspective correction. I use Lensdoc by Andromeda and have been very satisfied with its performance.

Roger

  -----Original Message-----
  From: John Vitollo [mailto:johnnyv@...]
  Sent: Wednesday, October 02, 2002 10:00 AM
  To: DigitalBlackandWhiteThePrint@yahoogroups.com
  Subject: [Digital BW] Re: Photoshop question (off topic)


  > I can cope with correcting converting verticals but I have not found a 
  > method to correct pincushion distortion in Photoshop.
  > Steve

  Steve,

  There is a action to fix barrel/pincushioning distortion in Photoshop. The link below 
  is for correcting barrel distortion before an image is stitched together for a 
  panorama. The action is only specific for the Nikon 5700 but can be modified for 
  any lens. The action is only a screen shot of the menu but is easy to make in 
  Photoshop and then modify from there.

  Go to the bottom of the page: Correcting Barrel Disortion in Photoshop

  http://www.JudyArndt.ca/pan5700/pan5700.htm

  Best,

  John V.


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[Non-text portions of this message have been removed]

.  I can 
> cope with correcting converting verticals but I have not found a 
> method to correct pincushion distortion in Photoshop.  

Try http://www.andromeda.com/
They have a photoshop filter called Lens Doc.
You can purchase it via download. It corrects pincusioning as well as
barrell distortion. I use it all the time. Works very well. It also
has perspective tools that let you square up 
the image as an option to the photoshop perspectine/distortion edits.
The Lens Doc fixes everything perfectly. Once set up. you place 2
pairs  dots on  curved lines you want 
the software to "bend" straight.  You don't have to pace the dots on
lines if there aren't any. They can be placed anywhere on the image.
These dots are just a reference for the 
software to grab something to straighten. You can see the effect all
the way into the center of the image. I was noticing a lot of curved
lines on the edges of my frames, especially 
if there was a bank of windows or french doors on the edge of the
frame. I thought my lens was pincushioning. I use an Arca Swiss 6x9
and I also configure it to shoot 4x5 with a 
conversion back.The problem was confined to the 6x9 roll film only,
and after searching the photo net posts, I believe that my lenses are
fine, the curving was caused by the film 
not laying perfectly flat. I guess roll film can develope a permanent
reverse curl near the roller if more than a few minutes pass between
advancing the roll. This results in the film 
not sitting prefectly flat at the edges, it gets a slight wave,
hence, my getting curved verticles at the edges towards the corners.  

John Luke

I use lensdoc but I have a hard time figuring out where to put those dots.
It doesn't always do what I expect

Teresa
www.teresalunt.com

======================

At 09:07 AM 10/02/2002 -0700, you wrote:

>Try http://www.andromeda.com/
>They have a photoshop filter called Lens Doc.
>You can purchase it via download. It corrects pincusioning as well as
>barrell distortion. I use it all the time. Works very well.

Fred Miranda has a good article that describes the use of
Helmut Dersch's free Panorama Tools at:
http://www.fredmiranda.com/distortion/index.html
-JimD



At 04:00 PM 10/2/2002 +0000, John Vitollo wrote:

> > I can cope with correcting converting verticals but I have not found a
> > method to correct pincushion distortion in Photoshop.
> > Steve
>
>Steve,
>
>There is a action to fix barrel/pincushioning distortion in Photoshop. The 
>link below
>is for correcting barrel distortion before an image is stitched together 
>for a
>panorama. The action is only specific for the Nikon 5700 but can be 
>modified for
>any lens. The action is only a screen shot of the menu but is easy to make in
>Photoshop and then modify from there.
>
>Go to the bottom of the page: Correcting Barrel Disortion in Photoshop
>
>http://www.JudyArndt.ca/pan5700/pan5700.htm
>
>Best,
>
>John V.
>
>
>
>Please visit the Group Homepage to check the Files, Bookmarks, Polls and 
>other resources as they are often being updated. The page is at:
>
>http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
>
>If you wish to receive no emails or just a daily digest, or you wish to 
>unsubscribe, please edit your Membership preferences by visiting this same 
>page.
>
>Please follow these basic guidelines:
>- Include your full name with your message.
>- Include the address of your website, if you have one.
>- As threads develop, trim off excess portions of earlier messages to keep 
>them short.
>- As the topic of a thread changes remember to change the subject header.
>- Good manners are required at all time. No personal attacks or 
>"flames."
>- Complete your Yahoo profile.
>- Before posting a question, search the message archives and the various 
>resources on the homepage.
>
>
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

Steve,
I had the same frustrations, and my response was to work with a 
software developer to solve the problem. After testing scores of 
lenses, measuring actual barreling and pincushioning, we came up with 
software that does the correction. This is not based on a simple 
spherical correction. The software will actually choose the best of 
over 100 correction curves, and interpolate between existing curves 
if necessary. THe software also helps with perspective distortion.  
The product has been out for 2 years, has been well reviewed. It is 
interesting that an Australian company just recently came out with a 
less sophisticated version of the same thing for triple the price of 
Lensdoc. 
I am not inclined to use this forum for advertising, but I believe 
this is the best solution for your specific problem. Try the demo of 
Andromeda Lensdoc and see what you think.
http://www.andromeda.com/
Stephen Kundell

--- In DigitalBlackandWhiteThePrint@y..., "scrber" 
<stephen.bate@m...> wrote:
> Had to do some internal architectural shoots a couple of weeks ago 
> that necessitated the nasty end of some wide angle lenses.  I can 
> cope with correcting converting verticals but I have not found a 
> method to correct pincushion distortion in Photoshop.  I know I'm 
not 

> really in the right forum for this question but if I promise to use 
> my VM set will someone pllllease help me out....
> 
> Thanks ;-)
> 
> Steve