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I have multiple images of (let's say) a busy street. All taken with the exact same angle, and the people are moving around.

It stands to reason that if I could compare all images and get only "the part that is common to all images", I would have an image of an empty street.

Any thoughts on how this could be achieved?

marked as duplicate by mattdm, Hugo, TFuto, NickM, John Cavan Jan 27 '15 at 18:20

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  • In Photoshop, use "Stack Mode" - see here: photo.stackexchange.com/questions/20953/… – MikeW Jan 10 '15 at 1:49
  • There are a myriad of demonstrations of this on youtube. Photoshop supports this effort through loading a stack, of images and automatically aligning them. – JDługosz Jan 10 '15 at 8:05

you have two choices

the first method use software (photoshop)

  1. shoot from the same angle using your tripod (preferable) - time laps shoots. or
  2. shoot when you can see the street is clearer as much as possible some shoots.
  3. now combine all your shoots in photoshop using Auto-align and median tool.

for more information please see that video https://www.youtube.com/watch?v=-Ck62S7lrPA

The second method is to use your camera with a long exposure using your tripod and a suitable ND filter depending on how long you expose and the light intensity of your scene. some do it using a square glass holder with a dark glass.

for more please see that video https://www.youtube.com/watch?v=T24_uq0AY6o


You can use StarStaX to average the pictures if you want. It has a lot simpler interface than Photoshop (and is free!) for that kind of task.

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