Great Kay, I will also take advantage of this information :)
Calvin, I also like very much the results obtained with this tutorial:
http://photoblog.edu-perez.com/2009/02/hdr-and-linux.html
I don't use it always but have already had good results on sky scenes. You
can also use different weights on the gimp layers and he also suggest some
parameters to vary. To the gimp part I have made a script to automate it for
a panorama group of images. I usually do an initial test then change the
script to use the parameters I have chosen. You can find them here:
http://cartola.org/hdr.sh
http://cartola.org/hdr-gimp.scm
You will notice I don't use raw and I changed to some similar commands to
make the same thing.
My example image (I must stitch it again, but the HDR part is good IMHO):
http://cartola.org/HDR-Leblon-pq.jpg
[ ]s, Carlos.
2011/6/5 kfj <_...@yahoo.com>
>
>
> On 5 Jun., 06:11, Calvin McDonald wrote:
> > Thanks Carlos. Command-line is working for me, other than one thing...
> > I gave it two images, one with a properly exposed foreground and a washed
> > out sky and the other the opposite, under exposed foreground and properly
> > exposed blue sky. The resulting image has a properly exposed foreground
> and
> > an improved sky but not as well exposed as the second photo. It's like
> it's
> > blending bad sky with good sky and coming up with fair - rather than just
> > taking the properly exposed sky and using it.
> >
> > Is this life or cockpit error?
>
> I'd say it's the latter. enfuse is a complex tool, and it's worthwhile
> to read it's manuall - even if you're not using it from the command
> line; I hope you'll have your hugin troubles sorted out soon. From
> hugin you can feed it command line parameters as well.
>
> The default settings used are:
>
> --exposure-weight=WEIGHT
> weight given to well-exposed pixels
> (0 <= WEIGHT <= 1); default: 1
> --saturation-weight=WEIGHT
> weight given to highly-saturated pixels
> (0 <= WEIGHT <= 1); default: 0.2
>
> I usually run enfuse with --staruration-weight=0, which I find gives
> better results. And, you're right, it's really blending bad sky with
> good sky, but you can tweak how much of what goes into the final
> result by using different statistical parameters. Here you can tweak
>
> --exposure-mu=MEAN center also known as MEAN of Gaussian
> weighting
> function (0 <= MEAN <= 1); default: 0.5
> --exposure-sigma=SIGMA standard deviation of Gaussian weighting
> function (SIGMA > 0); default: 0.2
>
> Have a look at the enfuse reference manual (which is really good and
> comprehensive) to understand what the parameters do precisely - you
> may want to shift mu to darker (lower) values and use a smaller sigma.
>
> Kay
>
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