Answers.Body: <p>You need to rotoscope every object in front of your "background". There is not simple solution, because AE cant tell the difference between you foreground and background. Even I can't tell, because people drop shadows on your "background", etc.</p>
  
  <p>You can try to use <a href="https://helpx.adobe.com/after-effects/using/roto-brush-refine-matte.html" rel="nofollow noreferrer">rotobrush</a> for that, but if you have there a lot of people, it will require a lot of work.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-03-01T23:20:28.747Z
Answers.Text: Ok but once I track the motion of the person coming in front what do I do with him to tell AE "this person shouldn't be affected b the mask"
Answers.UserDisplayName: phadaphunk
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-03-01T23:26:13.373Z
Answers.Text: Put it in a new layer above your video and adjustment layer. So adjustment layer can't affect it.
Answers.UserDisplayName: Shultc
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-03-01T23:14:41.013Z
Answers.LastActivityDate: 2017-03-01T23:14:41.013Z
Answers.UserDisplayName: Shultc
Body: <p>I have this shot which has the right door color corrected to make it look dark and red :</p>
  
  <p><a href="https://i.sstatic.net/4IEmQ.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/4IEmQ.jpg" alt="enter image description here"></a></p>
  
  <p>How would I go about making it part of the "background" so that when someone comes in front of it, he is not affected by the correction like in the shot below :</p>
  
  <p><a href="https://i.sstatic.net/yyGHY.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/yyGHY.jpg" alt="enter image description here"></a></p>
  
  <p>I tried looking into Masks as background or 3D layers but couldn't seem to find what I'm looking for. I'm sure it's an easy thing to do but I just need guidance on what to look / search for.</p>
  
Tags: <video><after-effects><video-editor><mask>
Title: Making background element out of a part of a video
UserDisplayName: phadaphunk
ThreadText: # Making background element out of a part of a video
  
  (Asked by: username_0 on 2017-03-01)
  
  I have this shot which has the right door color corrected to make it look dark and red :
  
  [![enter image description here](https://i.sstatic.net/4IEmQ.jpg)](https://i.sstatic.net/4IEmQ.jpg)
  
  How would I go about making it part of the "background" so that when someone comes in front of it, he is not affected by the correction like in the shot below :
  
  [![enter image description here](https://i.sstatic.net/yyGHY.jpg)](https://i.sstatic.net/yyGHY.jpg)
  
  I tried looking into Masks as background or 3D layers but couldn't seem to find what I'm looking for. I'm sure it's an easy thing to do but I just need guidance on what to look / search for.
  
  **Tags:** video, after-effects, video-editor, mask
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2017-03-01. Score: 1 | Accepted answer
  
  You need to rotoscope every object in front of your "background". There is not simple solution, because AE cant tell the difference between you foreground and background. Even I can't tell, because people drop shadows on your "background", etc.
  
  You can try to use [rotobrush](https://helpx.adobe.com/after-effects/using/roto-brush-refine-matte.html) for that, but if you have there a lot of people, it will require a lot of work.
  
  > **Comments:**
  > **username_0**: Ok but once I track the motion of the person coming in front what do I do with him to tell AE "this person shouldn't be affected b the mask"  
  > **username_1**: Put it in a new layer above your video and adjustment layer. So adjustment layer can't affect it.  
  
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