duane

10 Apr 2006 2,736 views
 
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photoblog image Trafalgar Square

Trafalgar Square

Trafalgar Square as the sun sets at twilight. Taken using multiple exposures and stacked together. This blends and averages the images, giving a silky smooth and noise free effect.

Unfortunately, this technique can only be done using a sturdy tripod, so that there's minimal shift between the multiple frames. Even so, there was a very slight shift in some of the frames I took, allowing me only to use 3 out of the set I took.

Trafalgar Square

Trafalgar Square as the sun sets at twilight. Taken using multiple exposures and stacked together. This blends and averages the images, giving a silky smooth and noise free effect.

Unfortunately, this technique can only be done using a sturdy tripod, so that there's minimal shift between the multiple frames. Even so, there was a very slight shift in some of the frames I took, allowing me only to use 3 out of the set I took.

comments (17)

WOW! Nice colour. Hmmmm just noticed the flag at the top left.
  • Veloran
  • Singapore
  • 10 Apr 2006, 03:20
Nice, I like the colours in the sky. I wish there was a bit more light on the statue though.
  • chunter
  • Salisbury, Wiltshire, UK
  • 10 Apr 2006, 09:00
This one works very well for me; I think you've belended them very well. There's still some colour in the sky which, strangely, is desirable for 'night' shots.

Although the flag was there, it's such a distraction that I would be inclined to crop it out since it is mostly unrecognisable as a flag.
The Maven: Good point about the flag being distracting. It was bothering me as well, I still have the files and am considering removing it. Haven't had too much time to work on the photo - was upgrading the ecard system for most of the weekend, and also I'm moving house this coming week. Not looking forward to it at all. Also, Shutterchance development has been (and will continue to be) a bit delayed since the guys are helping me move.
  • Dan
  • Great Britain (UK)
  • 10 Apr 2006, 10:11
Great shot, nicely exposed for the silky water fountain. Really good.
  • Shuva
  • India
  • 10 Apr 2006, 11:18
What is it? What caused it to have the soft effect? Just 6 seconds?
The Maven: 6 seconds is one of the reasons. The other reason is the averaging done by stacking 3 frames. So the effective shutterspeed was about 18 seconds in total.
  • Suby
  • MK, UK
  • 10 Apr 2006, 11:29
Well bro, if you can get this with multiple exposures, why the kaffafle with HDR? Now this is better than any HDR of this shot anyday.

Suby
The Maven: Actually, this shot still had some HDR done to it... though using a different technique. The 3 frames used to take this were taken at -1EV, 0EV and +1EV exposures. When I stacked the 3 frames, I used a layer mask to locally control the averaging - dark areas took more from the +1EV frame, highlights took more from the -1EV frame. This is minor compared to the normal HDR technique though.
  • Micki
  • 10 Apr 2006, 12:07
Beautiful, silky water effects!
Very nice result. Suby's comment confuses me, I thought that multiple exposures is what HDR is so how is this different to HDR?
  • Chantal
  • Netherlands
  • 10 Apr 2006, 12:44
Beautiful lighting!! Very sharp
  • suresh
  • Singapore
  • 10 Apr 2006, 12:55
Nice colors & exposure. The horizon is tilt in one side. Sorry if i am wrong. Thanks for the tips. Learned something today.
  • sk
  • Smallville
  • 10 Apr 2006, 12:59
very nice Duane, very nice indeed
  • Paul
  • 10 Apr 2006, 14:44
This is gorgeous! How do you stack the images? What blend mode do you use?
The Maven: Thanks for the kind comments Paul. They were stacked using opacity and layer masks in photoshop, no other fancy software involved. I learnt this trick from a guy called kiwi2 in the dpreview forums. In his own words:

"You can do it with Photoshop. Open the first one and duplicate a layer. Copy and paste the second one onto the first and select "difference" in the layer mode. Move it around until it is as black as possible. Go back to normal and set opacity to 50%. Flatten image. Now duplicate again and replete for the third image... only this time set opacity to 33% Flatten image and you are done."
  • Gonzalo
  • Puerto Rico
  • 10 Apr 2006, 16:14
Excelent photo! I like it so much! congratulations.
  • Dave
  • United States
  • 10 Apr 2006, 19:28
Impressive; nice compositing to get the shot you wanted. I all looks very natural.
I like the silkiness of the water.
Great image.
You have a lot of pattern work in your shots (repeting lines and such) so this shot caught my eye. From the aspect that I like these "kind" of shots and the fact that it is just a great shot.

The overall effect of your "stacking" method is to get different exposures in different parts of the photo, right?

Why not go under layers, add new adjustment layer, for curves, adjust the curve and airbrush mask the areas you don't want adjusted. Do this several times to get as many exposures or effect in one "base" photo as you need.

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for this photo I'm in a any and all comments icon ShMood©
camera Canon EOS 10D
exposure mode full manual
shutterspeed 6s
aperture f/9.5
sensitivity ISO100
focal length 23.0mm
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