How to remove item from video?

Arjen1979

Newbie Joined: Sep 25, 2013 16:55 Messages: 13 Offline

Solved by

Mar 06, 2014 13:50

Hi all,

Let's say I have an airplane that hangs on a few wires and I want to make it "fly" in a video. Then I have to remove the wires from the video. How do you accomplish that??

My first thought was a moving mask with a transparency (a PiP of the same image without the airplane) but I found out that masks cannot be moved. I tried ColorDirector and was able to colour the wire somewhat green (it was too small to do a nice job) but I don't know how to use this green colour in PowerDirector to make it transparant or something like that. I tried using ChromaKey, but using that, the original lines came back again.

So how do I delete the lines from the video??

BarryTheCrab

Senior Contributor Location: USA Joined: Nov 06, 2008 22:18 Messages: 6240 Offline

Mar 06, 2014 17:20

When you use Chromakey to make the lines transparent, whatever is BEHIND them is visible.
In your case, nothing was behind them, so they probably appeared black, correct?
Place your video into track 2, then, in the topmost track 1 place an image or video that is of the same color/pattern as you desire.

Here is a trick I pulled some time ago that may help.

This message was edited 1 time. Last update was at Mar 06. 2014 17:24

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Arjen1979

Newbie Joined: Sep 25, 2013 16:55 Messages: 13 Offline

Mar 06, 2014 17:47

That worked, thank you! But there's a difference between the still image and the moving image: I first shot a movie with just the background and than, without altering the position of the camera I shot the video with the airplane.

The problem is that the light came from the back so when I moved the airplane, there was a vague shadow of myself on the background. Applying the chromakey results in that the lines are still a bit visible since the background shot did not contain my shadow.

How can I reduce shadow forming to a minimum??

BarryTheCrab

Senior Contributor Location: USA Joined: Nov 06, 2008 22:18 Messages: 6240 Offline

Mar 06, 2014 17:58

Sometimes things need to be re-shot with your new-found skills. HP Envy Phoenix/4thGen i7-4770(4@3.4GHz~turbo>3.9)
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Arjen1979

Newbie Joined: Sep 25, 2013 16:55 Messages: 13 Offline

Mar 06, 2014 18:00

But how do you position the lights? It will always create a shadow and thus problems with the chromakey. Or are there other ways to delete the wires in the video?

BarryTheCrab

Senior Contributor Location: USA Joined: Nov 06, 2008 22:18 Messages: 6240 Offline

Mar 06, 2014 19:54

Perhaps a clear fishing line, or similar would be a better choice to suspend your props. You might even find a few good tutorial videos on Youtube. HP Envy Phoenix/4thGen i7-4770(4@3.4GHz~turbo>3.9)
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Carl312

Senior Contributor Location: Texas, USA Joined: Mar 16, 2010 20:11 Messages: 9090 Offline

Mar 07, 2014 15:03

Quote: But how do you position the lights? It will always create a shadow and thus problems with the chromakey. Or are there other ways to delete the wires in the video?

The subject of lighting is a big one.

There are hundreds of books written on photographic lighting.

There is not one way to light a subject. As a general rule, if you have two lights of equal intensity you can aim them at 45 degrees from the subject and background.

I made this web page a long time ago, it is about lighting to copy documents, but the same principle applies to get even light on a background.

http://www.carlmcmillan.com/lightingforcopying.htm

This message was edited 1 time. Last update was at Mar 07. 2014 15:04

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