[Hdri] correction for barrel distortion

[Fitzsimmons, Rob]

I could be wrong, but don't HDR creators need the original camera shot with
exif information? Doing Photoshop adjustments would lose that info. I'm
pretty sure Photosphere needs this, but I don't know if HDRShop does.
 
Rob F

-----Original Message-----
From: Kirk Thibault [mailto:kthibault at biomechanicsinc.com] 
Sent: Tuesday, January 17, 2006 9:03 AM
To: hdri at www.radiance-online.org
Subject: Re: [Hdri] correction for barrel distortion


Martin,

Photoshop CS2 has a Lens Correction filter that will help correct chromatic
aberration, vignetting and barrel/pincushion distortion.
Filter>Distortion>Lens Correction

However, I opened a HDR image (*.hdr) and the Filter>Distortion menu option
was not available, leading me to believe that it will not operate directly
on HDR 32 bit images.  Thus, it would seem that you would apply it to your
LDR sequence images before converting to a HDR image.  The filter permits
the applied settings to be saved, so you could open one image, applying the
correction and then save the settings for the subsequent application to the
rest of the image sequence, permitting automation in a batch action.  If
your sequence is taken with a tripod and the images are registered prior to
correction, I would guess that applying the same correction through saved
settings should displace the same pixels in each image and preserve image
registration.

I just upgraded to CS2 so I haven't played with it yet.

kirk



On Jan 17, 2006, at 10:11 AM, Martin Moeck wrote:


Assume you have a barrel distortion image like the one shown at
 
http://www.dcresource.com/reviews/nikon/coolpix5400-review/
<http://www.dcresource.com/reviews/nikon/coolpix5400-review/> 
 
towards the bottom of the page. 
 
1) Are there software tools or algorithms available to correct these images
before they are converted into an HDR image?
 
2) If not, is there a simple way to correct the HDR image for barrel
distortion?
 
Martin Moeck
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