Missed postings...

hdri
1

My last two messages to the list only went to the posters, as I hadn't set it up to automatically send responses to the list.

I have now done so, more for consistency with radiance-general than anything else. You now need not use the "reply all" button to get your post to the list. If you wish to reply to the poster privately, you will have to start a separate message, as you now do on radiance-general.

-Greg

···

Begin forwarded message:

From: Greg Ward <[email protected]>
Date: January 17, 2006 8:47:33 AM PST
To: Martin Moeck <[email protected]>
Subject: Re: [Hdri] correction for barrel distortion

Hi Martin,

Our first real post...

If you have Photoshop, you can apply a lens distortion filter to each 8-bit input image (saving and reusing the same filter) prior to combining them. The filter doesn't work on HDR images, even in CS2, unfortunately.

Some high-end cameras also come with distortion correction software, which you can apply in the same way as long as you're consistent.

Let me know if it works.
-Greg

From: "Martin Moeck" <[email protected]>
Date: January 17, 2006 7:11:08 AM PST

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

Begin forwarded message:

From: Greg Ward <[email protected]>
Date: January 17, 2006 11:38:36 AM PST
To: "Fitzsimmons, Rob" <[email protected]>
Subject: Re: [Hdri] correction for barrel distortion

Photoshop CS2 is pretty good about preserving the Exif header information, though I don't know for certain in this case. You can always override it in Photosphere using the Set->Other->Field... menu, or with the hdrgen -s option.

This is my second attempt to post -- I seem to be blocked for the moment, and I'm the moderator!

-Greg

From: "Fitzsimmons, Rob" <[email protected]>
Date: January 17, 2006 10:38:27 AM PST

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