Long exposure effect (links included)

    phiol
    Aug 19 2014 | 2:23 am
    Basically I would like to find a way to composite several "photoshots (maybe 5to8)" using jit.qt.grab to [jit.matrix @thru 0], having little to no alpha fade when doing feedback.
    here are images and patches (below) that demonstrate what I'd like to accomplish:
    composite :
    http://www.slate.com/blogs/behold/2012/12/06/shinichi_maruyama_using_new_technology_to_capture_nude_portraits_photos.html
    and I would like to do it with a strobe light to mimic this following one
    http://farm4.static.flickr.com/3150/2981691629_8cd9945660_m.jpghttp://farm4.static.flickr.com/3150/2981691629_8cd9945660_m.jpg
    -----
    Here are a few methods I've explored but with no complete success.
    -method 1.a) using slide and an open/close shutter approach
    -method 1.b)
    method 2. Maybe a way using jit.gl.node @erase_color 0 0 0 0.01
    Method 4 feedback no fade out and transparency like link number 2.
    Find a way to do jit.qt.grab image feedback , where every snapshot is added to a top layer this way there is no fade alpha blending.
    Endless thanks to all in advance.
    p.s. I'm sure I'm missing an info that will make this much more simple than these approaches.
    phiol
    • Ste
      Aug 22 2014 | 7:24 am
      About 4, maybe you can try by adding only the difference between current and previews frame to the current frame. Something like this.
    • phiol
      Aug 22 2014 | 2:54 pm
      Hi STE, thanks for the response and nice patch.
      Did you have a chance to look at the link I posted ? They demonstrate what is intended.
      I don't know if I'm using your patch correctly, but the results it gives me is a highlighted flair. Is that what you intended ?
      ---
      I ending up finding a solution using this patch.
      Basically, the subject (Me :-)!) in a dark room or in front of a dark background and I use jit.slide @slide_up 1. @slide_down 20.
      it basically gave me the result of link 2.
      here it is