 Cherie
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| Joined: 25 Sep 2005 |
| Total Posts: 60 |
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Chroma transitions ??How do you use them ??!!!
Posted: 02 Oct 2005 01:54 PM |
I have been playing out with the various new transitions and effects ..really cool I have made a video to practise but it's not my holiday video yet ..this one is a Stargate video but my holiday video will come soon :)
Anyway ..I didn't figure out how to use all the Chroma transitions !!!... even when I inserted one and extended it ..I could not see what it was supposed to do .. And why all those different colours ??
It must be a great transition because there are plenty of them but help please !!!
How do you use it ?
Thank you :)
Cherie :) |
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pinky
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| Joined: 30 Aug 2005 |
| Total Posts: 48 |
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Re: Chroma transitions ??How do you use them ??!!!
Posted: 03 Oct 2005 01:45 PM |
Add chroma background video and required background to storyboard in order such that:
First one is the background u wish to be in u'r resultant video and second one to be chroma background video. Use chroma color transition(color which u want to remove from u'r chroma video) between these both videos and drag the transition completely as far u could. |
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Re: Chroma transitions ??How do you use them ??!!!
Posted: 03 Oct 2005 02:15 PM |
For the benefit of those that aren't even familiar with what "Chroma Keying" is, it is occasionally referred to as blue-screening, green-screening, background removal, etc. For anyone that has seen Superman flying or watched the weather report, the idea is that you film an actor against a colored background (not a color worn by the actor) and then the computer is told what that color is (e.g. blue, green, etc.). The computer takes all pixels that are that color and removes them from the video clip. Then that clip can be overlayed on another clip. Voila, you have Superman flying over Metropolis, or a weather forecaster pointing to today's highs in Duluth, Minnesota.
In other video editing applications, chroma keying is performed between two video tracks where you put your background clip on one video track and the blue-screen (green-screen, whatever) clip on the other. Then the program merges the video together.
In Windows Movie Maker, there is only one video track, however, we can fool WMM into doing this same effect by placing the two clips next to each other, applying a custom "Chroma key transition" and then stretching the transition length so it is almost* the full length of the two clips. The result is overlayed video just like the Superman or weather report clips.
One other caveat with WMM's method of doing Chroma keying is that it is very particular about the color of the background. It expects the exact RGB (red,green,blue) values for the color to be removed. So if you want to remove a blue background, every pixel has to be the specific blue referenced in the chroma key transition. With real video, even if it is filmed in front of a blue background, it may not be evenly lit and therefore it is unlikely that every pixel is exactly the same shade of blue. This is why people often report problems trying to implement the Chroma key transition. The Chroma White, Chroma Black, Chroma Blue, Chroma Green, etc. transitions all work with a specific color and therefore are best used on video that has been created synthetically (i.e. an animated logo with a black background, or output from a 3-D rendering app with a blue square for a TV screen).
For "real world" applications, there is one Chroma key transition (Chroma non-red) that works on a blue screen but allows for some tolerance. Thus, if you have various shades of blue in your video clip, they will all be made transparent, without them having to be the exact pure blue of RGB #0000FF.
For more on Chroma Keying Basics, here's a good post to review:
view post 10722
-=Blaine=-
*WMM does not allow two clips to overlap completely, so the best you can do is overlap with a couple frames not overlapping. |
Blaine
Movie Maker (Custom Titles, Effects. etc.)
Puzzles
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Re: Chroma transitions ??How do you use them ??!!!
Posted: 06 Oct 2005 12:03 PM |
| Hi Blaine. I was wondering if there is a tutorial that we could download or reference that included the steps to follow regarding the procedure for the Chroma Transition Process. Is there any technique for creating the video on a blue screen that would put the foreground image in prespective relative to the background movie (preventing the foregound from floating in space relative to the background movie)? Because we don't have the option of a second video track we probably can't move the foreground video up or down to get the appropriate perspective. If that was an option to begin with. Hope I made some since. |
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Re: Chroma transitions ??How do you use them ??!!!
Posted: 06 Oct 2005 12:06 PM |
| Oh, one more thing. Is there any technique available for creating a movie within Alpha characters in a foreground movie and overlaying that text/movie over a background movie? |
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Cherie
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| Joined: 25 Sep 2005 |
| Total Posts: 60 |
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Re: Chroma transitions ??How do you use them ??!!!
Posted: 06 Oct 2005 05:35 PM |
Thank you very much I will be looking and reading the review as I really really want to use the Chroma transition I think it's fab :)
Caty :) |
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pieter
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| Joined: 03 Apr 2007 |
| Total Posts: 1 |
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Re: Chroma transitions ??How do you use them ??!!!
Posted: 03 Apr 2007 12:46 PM |
| ow do you apply a custom Chroma key transition in WMM |
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Re: Chroma transitions ??How do you use them ??!!!
Posted: 03 Apr 2007 12:57 PM |
Can you explain more? Do you have a custom chroma key transition already made? What color (RGB value) are you using for the chroma? Is this an exact match for the background of your clip?
If so, then all you do is put the two clips (one with your color in the background, and the other being the replacement background). Put the custom Chroma key transition between the two.
Remember the caveats that custom chroma transitions expect an *exact* match of the color specified, so if you are expecting RGB FF00FF to match various colors of purple, it will only match RGB FF00FF. It won't match FF01FF, FE00FF, FF00FE, etc. which we would still perceive as purple, but the computer won't. The custom chroma key transitions have no tolerance factor. |
Blaine
Movie Maker (Custom Titles, Effects. etc.)
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colmon9
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| Joined: 25 Sep 2006 |
| Total Posts: 9 |
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Re: Chroma transitions ??How do you use them ??!!!
Posted: 11 Jun 2007 05:16 PM |
| how do you put video in the back ground |
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