PanoTools:
Re: Blending Large Overlaps
jeffrey 2006-Jun-11 19:59:52
> Posted by: "Geraldine Joffre" #removed# geraldine_joffre
> I'm a bit concerned that you mention a noise problem.
> The noise problem is only if you choose the HDR tonemapping functions.
> Most panographers prefer instead to use the automatic exposure
> blending functions of Photomatix, which I recommend you to try. One of
> the advantage of blending exposures is that the combined image will
> show less noise than the source images.
This is true - useful for night shots - I've used the "average"
function on 4 - 10 images, and the noise was reduced a great deal!
However, the noise with tonemapping has usually meant that I can't use
it. And I don't really need photomatix for other stuff.... adjusting
for gamma and USM (and sometimes the Lightness channel) usually give
me the results I want, and if necessary, I combine another set of
shots for the sky.
> This is incorrect. Photomatix offers 5 methods for blending exposures,
> each one based on a different algorithm. Then it also offers a
> tonemapping and a 48-bit compression algorithm.
What I meant was - it offers only one tonemapping algorithm, but there
are many available.
>
> > and it makes halos
> Not if you adjust the settings (I assume you are referring to the tone
> mapping tool). Our FAQ explains how to do that
> http://www.hdrsoft.com/support/faq_photomatix.html#halo
mmm :-) often the halos don't bother me, but it's usually noticable in
the sky, and on large areas of similar tone.
>
> The tone mapping tool is not automatic, it offers many controls to
> adjust to one's taste. If you prefer an automatic process, please use
> the exposure blending functions.
>
Anyway, I think Photomatix *is* a very decent piece of software, but
it's not in my opinion totally finished yet - it would be great if it
offered 10 - 20 different tonemapping algorithms, perhaps showing a
preview for each one for a given HDR image. I like the "average"
function, but the other ones imo seem unnatural to me.
I do recommend anyone who has not yet tried it, to give it a spin! (it
will at least teach you to always bracket when you shoot, just in
case...)
jeffrey
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