Digital Double Exposure?

Discussion in 'Canon EOS' started by tom lavin, Aug 31, 2005.

  1. I've never seen this topic addressed, and I don't know of a digital camera that can make a
    double exposure. I'm just curious as to why not. I can only surmise that noise could be a
    problem with a bad exposure (and a good double exposure is just two bad exposures
    sandwiched together). It just seems to me that a digital camera can do nearly everything you
    can imagine - except that............Tom
  2. None will do double exposures. It wouldn't be technically impossible, but nor would it have much point. Any decent image editor can combine two pictures with far more flexibility.

  3. Quite easy to do in Photoshop, and you control everything.

  4. What would be the point? You can easily create a double exposure in an image editing program such as Photoshop or Gimp.
  5. using the right settings and multiple flashs you can create a "digital double exposure", but it
    is not like film.
  6. does this count?, this was done in a dark room with two flashes.
  7. I understand this can be done in Photoshop - I've done it many times. However, there's a
    completely different mind set in doing it in Photoshop than doing it in the field. The
    experimental and unknown output that is fun to do with film it not an option with Photoshop.
    I was more curious about the technical reasons why is isn't or can't be done..........Tom
  8. Well, technically still one exposure... But PS has all but eliminated the 'need' for double
  9. Neat idea, Tim.
  10. It cant be done in the tradional sense because, there is no way to work on the same film
    exposure in a digital camera, other than the example I gave above. Photoshop was only used
    to adjust the curves in that photo. The multiple images of the subject were done in the same
    exposure. 15 seconds a darkroom and a flash.
  11. .

    A FIRST! This is the first time I've ever seen three simultaneous responses to a post on (all at 8:46 p.m.). Wow.

    Sorry about the OT nature of my response; I do agree with Tom about the unpredictability and spontaneity of doing it "in-camera," not knowing exactly what the effect would be.
  12. The Nikon D2x can be used to create multiple-exposure images in-camera.
  13. I may be wrong, But I believe the Fuji S2 can do double exposures...
  14. ky2


    Kaden you are right. The S2 can do more than double exposures.
  15. Notwithstanding the answers that say that the Fuji and the Nikon can do double exposures, here is my take on the subject. In film the "sensor" is a chemical reaction that is cumulative, or analog if you will. Teh more light that you add the darker the spot becomes. And the process is additive, if I open the shutter once, the light reacts with the film, if I open it again, it adds to that reaction. In the digital world the sensor reports, as a numeric value the intensity of the light that strikes the sensor and then it resets for the next exposure. To get the double exposure the sensor would have to "remember" the last shot and add the value to the new shot. Entirely possible I suppose, but a bit of a problem for the programmer. All of this comes from someone with just enough knowledge on the subject to get in trouble with.
    I do appreciate the question, I have some rather old photos of my family that were accidentally double exposed and they are priceless. They accidently juxtapose people in time and space that would be impossible to compose.
  16. You can emulate a double exposure in Photoshop most correctly by overlaying images with the layer set to screen.

    It's additive, just like a real double exposure. That means your background will still have to be half exposed each (best to do at least one with a black background).
  17. << None will do double exposures. >>

    Not correct.

    Fuji S3

    Nikon D2X

    Pentax *ist D

    All three do multiple exposures in-camera.
  18. I stand corrected. But then, I considered it so trivial either way I didn't bother fact-checking that one.


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