[Hdri] correction for barrel distortion

[Kirk Thibault]

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/
>
> 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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> Hdri at www.radiance-online.org
> http://www.radiance-online.org/mailman/listinfo/hdri

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