Barrel Distortion

TN
Posted By
Ted_Nichols
Feb 27, 2004
Views
478
Replies
12
Status
Closed
No where do I read if or how one can correct for barrel distion in photoshop. Is there a method. Filter–Distortion–Pinch or Shpereize do not correct properly. So does anyone know another method ?

Ted
Related Tags
distortion

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L
larry
Feb 27, 2004
You can try playing with Transform Distort or Transform Perspective, but the best way is using Panoramic Tools, a free panoramic stitching program that has a steep learning curve. You can read more about it on Max Lyons web site:
<http://www.tawbaware.com/maxlyons/>

Larry Berman
ND
Nick_Decker
Feb 27, 2004
Larry, I use Pano Tools with Max’s excellent PT Assembler to create panoramas, but have never been able to figure out how to use it to correct barrel distortion. The times that I’ve tried it ended in frustration (too many numbers for my brain to compute <g>).

Ted, I’ve never had much luck correcting barrel distortion in PS, so I opted for the LensDoc filter:

<http://www.andromeda.com>

A little pricey, but it works well.

Nick
L
larry
Feb 27, 2004
Hi Nick,

I forgot about LensDoc. I have it sitting here from a review I did a few years ago. You’re correct in that it’s much easier but cost more.

Larry Berman
ND
Nick_Decker
Feb 27, 2004
Larry,

I often shoot interiors using wide zooms, which can result in some pretty obnoxious barrel distortion. LensDoc has paid for itself many times over.

Nick
JS
John_Slate
Feb 27, 2004
<http://www.theimagingfactory.com/>
ND
Nick_Decker
Feb 27, 2004
Thanks, John. Downloaded the trial, and at first glance it looks good.

Nick
ME
mike.engles
Feb 27, 2004
Hello

This one is very interesting

<http://flofilters.free.fr/>

Mike Engles
MV
Mathias_Vejerslev
Feb 27, 2004
I use Helmut Dersch´s original FREE PanoTools (not PTAssembler) when I need to correct a single image barrel distortion. It´s pretty straightforward and gives you good results.

Here´s a page I did many moons ago:

<http://www.2morrow.dk/75ppi/coolpix/distortion.htm>

I dont know why Nick find it too complicated. Probably because he is an old man <g>.

< http://www.google.com/search?sourceid=navclient&hl=da&am p;q=PanoTools+barrel>

Mathias
ND
Nick_Decker
Feb 27, 2004
I dont know why Nick find it too complicated. Probably because he is an old man

Hey, watch it, kid!

8~)
RH
r_harvey
Feb 27, 2004
See also Best method for removing barrel distortion? <http://www.adobeforums.com/cgi-bin/webx?13@@.2cd04f5a/0> [Photoshop/Macintosh Forum]
RH
r_harvey
Feb 28, 2004
It’s a shame that digital cameras mostly have zoom lenses. At short focal lengths, most zooms cause barrel distortion; at long focal lengths, they often do pincushion distortion. There’s usually sweet spot somewhere in the middle of the zoom range, where everything’s rectilinear.

If you have to use a zoom lens, and lines have to be straight, it’s a good idea to test, and find the focal lengths that do not cause as much distortion.

If it all has to be straight, not even keystoning, a tripod and bubble level would help, too.
ME
mike.engles
Feb 28, 2004
Hello

I have just bought Undistort, only 15 Euros or 15 USD.
It is pretty good, also has correction for chromatic aberation. Gui is good, but preview is a little small, but has a zoom as well as a grid. Demo at <http://flofilters.free.fr/>

Mike Engles

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