Guys,
when you say "24 bit jpeg" almost everybody thinks of this as "full
color (RGB), 8 bits per channel".
What is needed for HDR work, is either a floating point format (about
12 bits per channel, would be sufficient, but 32 bits per channel are
normally used in hugin) or a high-bit-count fixed-point
format. Something like 16 might get close, but 24 bits per channel.
may be more appropriate.
JPEG format is not appropriate for non-8-bit-per-channel-data. So
Carlos in the workflow that you describe you're truncating a lot of
information when you output your intermediate files into the 8-bit
jpeg format.
So... Carlos, I would suggest that you try saving your intermediate
files as tiff, and then find out what options you have to create a
32-bit-per-channel-floating-point intermediate file. Then Hugin can,
while stitching, apply proper exposure corrections and things like
that. (or are you fixing the exposure bracket for the whole panorama?
In that case Hugin's exposure correction should be unneccessary.)
Roger.
On Mon, Nov 19, 2012 at 08:35:41AM -0200, Carlos Eduardo G. Carvalho (Cartola)
wrote:
> Hi,
>
> just to clarify, I don't work with 24-bit jpg. I usually shoot in JPG and
> work with it in 8 bits. But alit_image_stack can deal with tif and you can
> work with tif all the time. I just put JPG in my example because I use it :)
>
> I sometimes have some ghosts in the final result of the enfusion, but I
> doubt if it would solve using a larger image. I think they happen because
> of parallax differences. I can clearly see that part of the image is good
> and another is not, so I think align_image_stack has done it's job. The
> solution (maybe) would be distort the image before fuse them and maybe
> hugin does that, I don't know. In fact I have never tried to make the
> exposure stacks directly into hugin. Maybe I should also give it a try :)
>
> And surely the best option of all is to stabilize the camera to shoot, but
> sometimes it is a little hard to do:
> http://cartola.org/fotos/_cache/Diversas/Engenhocas/_screen/20111004-mastro.jpg
>
> Cheers,
>
> Carlos E G Carvalho (Cartola)
> http://cartola.org/360
> http://www.panoforum.com.br/
>
>
>
> 2012/11/18 TvE <[email protected]>
>
> > Carlos, thanks for posting your steps. Running align_image_stack from the
> > command line sounds like a nice idea. You could also output the result into
> > the .pto file, I believe. I don't know about pre-fusing each stack into a
> > 24-bit jpg. I would be concerned that you could end up with images that
> > have very different dynamic ranges and that don't blend well into the final
> > pano. E.g. if one stack has sunset-to-dark and the other is all-dark. But
> > maybe enfuse deals with that properly or maybe those scenarios don't fuse
> > well either way... If I have the time I may give the two approaches a spin.
> > Another advantage of not pre-fusing is that align_image_stack sometimes has
> > difficulties, specially when large areas are very dark or blown out in one
> > of the images of the bracket and it's nice to be able to adjust the control
> > points in hugin. Ah. maybe we can collect some more wisdom and then turn
> > this thread into a wiki page.
> >
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