[Hdri] correction for barrel distortion

[Kirk Thibault]

HDRShop will permit you to manually specify the exposure increment  
between each image in a LDR sequence.
------------------------------

Kirk L. Thibault, Ph.D.
kthibault at biomechanicsinc.com

p.  215.271.7720
f.   215.271.7740
c.  267.918.6908

skype. kirkthibault




On Jan 17, 2006, at 1:38 PM, Fitzsimmons, Rob wrote:

> 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/
>>
>> 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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