[HDR-photo] Following on questions...

[Jack Howard]

John:

Welcome to the weird science of HDR.

There are really only guidelines, not hard and fast rules.

I've gotten great images with as little as two or three images
bracketed over a large range, and had other images that only looked
awesome with like 7 or 9 exposures.

Leaving one out may have little impact, or it might produce a less
than satisfying images. Experimentation is the key.

In my new eBook (http://www.oreilly.com) (it should be available later
this afternoon/tonight at that link) I talk about a number of ways to
generate tons of LDR source images, with the thinking that it is
better to have too many than not enough source images.

It's at a high-level, and I don't deepdive into the math and science
too deeply. It's more a crash course and walkthrough of PSCS2,
Photomatix and FDRTools workflows geared not to this listserve core
audience, but more to the HDR newbie, but hopefully there are some
valuable insights for HDR users at all levels.

Jack Howard
www.PopPhoto.com



On 2/14/07, John Callan <john at shoutpictures.com> wrote:
> Dear Ferrell
>
> >  Can you get back with the group as to how many images
> > are needed based on the rules. Also, any critique of this is appreciated.
>
> I spent all of yesterday producing several finished HDR's of each different
> view. Each one had one more exposure added then the previous. I found that
> as I added more exposures the detail within the finished shot improved and
> that it wasn't until I got to around 12 exposures that I was beginning to
> feel happy with the end result. Maybe it was the subject matter, it was a
> dark night (they are usually ! ) and I was shooting cafes around the town
> square. They had neon signs with street lights and shops to the sides. I
> wanted to be able to read the neon signs and see into the shop windows.
> Around the 12th exposure I was beginning to get the desired effect and so
> worked on from there.
>
> Am I doing something horrendously wrong ?
>
> John
>
> John callan
>
>
>
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-- 
Jack Howard
732/682-7628
www.sportsshooter.com/jackhoward