I do this kind of thing fairly often but in a more hands-on way. I thought this was pretty darned impressive and automated:
jnack.com/adobe/photoshop/fountain/
mclarkson 2008.02.15, 08:06AM — Fairly awesome Photoshop trick
Walt 2008.02.15, 06:50PM —
Originally posted by: arigato
Holy crap, that's AWESOME.
I have played with the auto align tool to varying results...
this demo worked slick as snot
Walt 2008.02.15, 07:01PM —
to add to the quality of the finished image,
one might consider taking one of the originals,
placing it atop the automated composite, aligning it
and then masking the layer completely to allow zooming in and painting on the mask [with white] to bring back in any detail that has been blurred by the Median blend
notice the water stream on the fountain, and I imagine the person in the red didn't hold still enough not to blur slightly... leaves in trees would also be a place where the masking could 'sharpen' the look of the composite
just some thoughts
rogue_designer 2008.02.15, 07:29PM —
holy!! that's very cool.
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(Si hoc legere scis nimium eruditionis habes.)
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mclarkson 2008.02.15, 09:20PM —
Good points, Walt and I'm sure I would but, day-um, he got 90% of the way there in no time.
p.s. I can never remember which forum to post things in.
Technomancer 2008.02.15, 10:46PM —
Originally posted by: Walt
notice the water stream on the fountain...
just some thoughts
maybe me being stupid - but I thought that the reason that he did this was to get the motion blur/slow shutter speed on the water so that you get the sense of movement.
Walt 2008.02.16, 07:53PM —
could be, if that is waht you want to do...
but, in the case of the example—I am afraid I carry the baggage of past discussion and examples where it was the people moving about that bothered the photographer
the trick has actually been used, dare I say developed, as a method for getting rid of low-light noise which is generated randomly by chips/sensors... so, two or three shots of the same subject, in low light, which have noise problems, treated in this manner will cancel out the noise [because it is random, and different from image to image]
in the case of the fountain, the people are noise
arigato 2008.02.17, 06:03PM —
interesting on the noise reduction, I didn't know that - thanks for the tip!
Walt 2008.03.01, 01:18AM —
one thing someone commented on today, this process works in the Extended version of Photoshop... for those using Photoshop CS3 Standard, when this process gets to the Smart Object Stack Mode selection, are you offered these options?
I have the Extended versions on both my machines & couldn't verify if this was 'universal'
birdless 2008.03.06, 03:54PM —
I've used this technique, and variations on it, to varying degrees of success. When it works, it's awesome, when it doesn't, it's extremely frustrating, because I can't figure out what makes some work and what makes others not. I've even had the same stack of images work some and not work other times! 
possak 2008.03.11, 07:11PM —
i must be using cs3 standard cause when i get to the smart objects/ stack mode, it's blanked out and non functional. that's weak. makes this whole thing almost useless if you can't get to the last step.
Walt 2008.03.11, 08:20PM —
someone had been mentioning a script for averaging the layers once aligned...
yet, I don't know if the script would do better what I would do myself with a few quick layer masks
what the script does is basically what one would need to...
for doing the mean averaging manually,
by setting the opacity of each layer to 100 / LP, where LP
= Layer Position. That is, the bottom layer is in Layer Position One,
so it has 100 percent opacity, the next layer up is LP2, so is 50
percent, next is LP3, so it is 33 percent, etc.
I can shoot an email requesting the script if you would like it
possak 2008.03.11, 10:09PM —
hmm, i think the layer masks method would be fairly good here. couldn't use it as the noise trick, but i've done a similar variant of that script that loses the noise. also, noise ninja is a cool little plugin that does some nice things. i think the same can be done with some of the new blur filters though or unsharp mask.

