A very common technique used in movies is chroma keying, often referred to as green screen. Chroma key involves replacing a certain color in an image with an image that is not actually there. Chroma key and green screen actually use the same principle. The term “green screen” became popular (instead of chroma key) because a lot of studios started using a green backdrop (green is very distinct from the color of human skin, makes it easier to edit the video in post-processing).
Learn How to Chroma Key! Substitute a
Video Into a Consistent Color Backdrop
Learn how to Chroma Key! Have you seen a TV presenter standing in front of a weather map? The technique used to achieve that is known as chroma keying. Here is a chroma key tutorial!
Chroma keying Examples
The best way to explain "What is Chroma Key" is by taking a few examples. You will then be able to relate to it instantly.
The first example to which almost everybody can relate to is the scene of a TV weather presenter standing in front of a weather map.
I bet you have seen that!
What about movies with lot of special effects? Have you seen actors standing with computer generated creatures?
Do you know what video technique is used in the above examples?
It is known Chroma Key or Chroma Keying!
What is Chroma Key?
Chroma-key is a technical term used in the movie/video production parlance.
It simply means substituting another video picture source into a consistent color backdrop. The backdrop sits behind the object, for instance, a person speaking or acting in front of the camera.
The most commonly used color backdrop is Green; another favorable alternative is Blue.
How to Chroma Key? The Chroma key Tutorial
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Step 1
The first step is to video shoot the chroma-key clip, which will be the one in the foreground.
Ensure your main subject is standing against an evenly lit green screen. You also need to ensure that the person in the shot is not wearing clothes of the same color; else the overall effect will be very bad.
Step 2
Choose the clip that is going to be used to provide the background action.
Step 3
Drag the background clip to the timeline. Then drag the green-screen clip to the overlay track such that the two are parallel on the timeline.
Since you are effectively merging two video clips, you will need these two video tracks on the timeline.
Step 4
The last step is to apply the effects. Select the Chroma key (CSO) effects from the video effects section and tweak the substitution till you get it right.
Once you have the two video clips in place, it is just a matter of using the appropriate picture processing features that is provided by the video editing program.
Summary
I hope this chroma key tutorial helped you in understanding what this video technique is all about. Go ahead and try out some chroma keying on your own. Now you can get somebody from your family to be the TV presenter standing in front of a weather map. Happy chroma keying!
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