Answers.Body: <p>You'll need to separate the spider from the background somehow. Then you can stack successive images of the spider on top of the initial background, and the previous spider image frames.</p>
  <p>here's an ascii art representation</p>
  <pre><code>        sp5-------------&gt;
        sp4---------------&gt;
      sp3-----------------&gt;
    sp2-------------------&gt;
  sp1---------------------&gt;
  bg----------------------&gt;
  </code></pre>
  <p>So on the first frame we see the BG with the first Spider frame composited above it. This frame is held, then on the next frame we add spider frame 2 and hold, then on the next spider frame 3 is added, and so on.</p>
  <p>How you actually achieve this depends on the software you're using.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-05-18T09:15:20.690Z
Answers.Text: I can do it manually but actually I'd like to automatize it as much as possible. I can use softwares like Photoshop, Premiere, After Effect if needed.
Answers.UserDisplayName: Valentin Macé
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-05-19T02:26:23.847Z
Answers.Text: You can script AE with extendscript to do this https://ae-scripting.docsforadobe.dev/
Answers.UserDisplayName: stib
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2021-05-18T02:36:40.193Z
Answers.LastActivityDate: 2021-05-18T02:36:40.193Z
Answers.UserDisplayName: stib
Body: <p>I have a video of a static background with a spider which is the only moving element.</p>
  <p><a href="https://i.sstatic.net/tgfqqm.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/tgfqqm.png" alt="enter image description here" /></a></p>
  <p>The spider is going forward for a few seconds, then the video stops.</p>
  <p>I want to summarize the video into a single image where the background doesn't change, but where we see each frame of the spider going forward, like a superposition. Something that I can illustrate with the following image:</p>
  <p><a href="https://i.sstatic.net/bor5hm.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/bor5hm.png" alt="enter image description here" /></a></p>
  <p>I understand that I will probably need to downsample my video to a few frames, <strong>but I don't know how to do the rest</strong>. If needed I can put a green background like: (but I'd prefer not to)</p>
  <p><a href="https://i.sstatic.net/LJP4om.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/LJP4om.png" alt="enter image description here" /></a></p>
  <p><strong>EDIT: This is the kind of results that I am looking for</strong></p>
  <p><a href="https://i.sstatic.net/2meVP.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/2meVP.png" alt="enter image description here" /></a></p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2021-05-15T12:47:59.087Z
Comments.Text: You ned to look for something about "image stacking"
Comments.UserDisplayName: tomh
Tags: <video><animation><effects>
Title: Keep residual image of an element in a video
UserDisplayName: Valentin Macé
ThreadText: # Keep residual image of an element in a video
  
  (Asked by: username_0 on 2021-05-14)
  
  I have a video of a static background with a spider which is the only moving element.
  
  [![enter image description here](https://i.sstatic.net/tgfqqm.png)](https://i.sstatic.net/tgfqqm.png)
  
  The spider is going forward for a few seconds, then the video stops.
  
  I want to summarize the video into a single image where the background doesn't change, but where we see each frame of the spider going forward, like a superposition. Something that I can illustrate with the following image:
  
  [![enter image description here](https://i.sstatic.net/bor5hm.png)](https://i.sstatic.net/bor5hm.png)
  
  I understand that I will probably need to downsample my video to a few frames, **but I don't know how to do the rest**. If needed I can put a green background like: (but I'd prefer not to)
  
  [![enter image description here](https://i.sstatic.net/LJP4om.png)](https://i.sstatic.net/LJP4om.png)
  
  **EDIT: This is the kind of results that I am looking for**
  
  [![enter image description here](https://i.sstatic.net/2meVP.png)](https://i.sstatic.net/2meVP.png)
  
  **Tags:** video, animation, effects
  
  > **Comments:**
  > **username_1**: You ned to look for something about "image stacking"  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_2 on 2021-05-18. Score: 1
  
  You'll need to separate the spider from the background somehow. Then you can stack successive images of the spider on top of the initial background, and the previous spider image frames.
  
  here's an ascii art representation
  
  ```
          sp5------------->
        sp4--------------->
      sp3----------------->
    sp2------------------->
  sp1--------------------->
  bg---------------------->
  
  ```
  
  So on the first frame we see the BG with the first Spider frame composited above it. This frame is held, then on the next frame we add spider frame 2 and hold, then on the next spider frame 3 is added, and so on.
  
  How you actually achieve this depends on the software you're using.
  
  > **Comments:**
  > **username_0**: I can do it manually but actually I'd like to automatize it as much as possible. I can use softwares like Photoshop, Premiere, After Effect if needed.  
  > **username_2**: You can script AE with extendscript to do this https://ae-scripting.docsforadobe.dev/  
  
  ---
  
  