Before we go and take a look at Chroma key, we need to understand what is keying?
Keying is a composition effect that takes a part of an image
or a video and makes it transparent. This part of the image or video is chosen
based of color blue or green.
There are different types of keying Adobe After Effects such as
- Color difference key
- Inner/outer Key
- Linear color key
- Keylight or Chroma Key
In Keylight or Chroma Key in Adobe After Effects, we take a
composition of two images or two videos and compose them together in a single
timeline.
As now we have understood what is Keylight or Chroma Key in
Adobe After Effects now let's see how to make this happen.
For example, let's make news channel compositions.
First you would need a background.
The background can be an image but it would be suitable if it
is a video related to news channel appropriate.
Add an anchor
Now we would need an anchor who is reading some headlines
with blue or green background for this part you can download this an appropriate
and suitable clip from the internet or shoot it yourself in front of a green or
blue background.
You can shoot this clip otherwise standing or sitting; if
sitting makes sure there is a desk you are sitting behind to give your
composition a formal look. If you are downloading the clip from the internet
make sure the anchor and the news, he or she is reading, complements the
background. If the size of the anchor is cropped or zoomed-in in the clip make
sure you resize it to the proper proportions.
Add a Table
To make it more realistic add an image of table in front of
the anchor to hide any cropped areas. Remember to resize the table according to
the proportions too otherwise it may look out of proportion and unrealistic.
Now you can start to make the news channel composition
First, we need to go to a new project to make a
new composition, give any composition name as you desire then
choose preset for the composition. You can choose any preset from the several
presets provided in the drop-down menu or choose custom and give your own
desired size.
After that choose the Pixel Aspect Ratio, you can
leave it at 'square pixels' or choose any other from the drop-down menu.
Then choose the Frame rate again
you can leave it at 29.97 frames per second or choose any other option from the
drop-down menu.
After that, you need to resolution in which
you want to work on while composing your video.
Then you need to enter the duration in which
you decide how long you want the video to be. After that, we finally choose the
Background color you want to work on.
Remember whatever background color you choose in the final
render the background will be black. For any other background color, you need
to take a solid layer in the composition and make that the background.
After clicking on OK go to File click on import
and bring all the files in the project panel then drag all the files in the
timeline panel.
Arrange the clips and images wherever they look appropriate.
Then choose the anchor layer with a green or blue background and to Effect
options from many bars.
Choose Keying then Keylight (1.2) then take the
eyedropper from the Screen color option and choose the background of the
clip which is blue or green.
This will make the clip or image under this layer visible.
Now readjust the layers above to make the composition look
realistic.
Add an adjustment layer to the composition to colorize the
video and make it presentable.
Now that we have seen how we can make a news video clip with
the help of chroma key let's see where else chroma key is used.
Chroma Key is used in movies as a visual effect (VFX), in
whether showcase for news channels, in music videos or in any simple images
with plain green background.
Chroma key also has its pros and cons is a
very simple and easy tool.
Pros - With Croma key, we can make a different composition
with the same image or video by just changing the background.
Cons -But chroma key also has some of its
difficulties after changing the background the edges of the foreground image
have to adjusted so that it looks realistic.
Here we have seen how and where to use chroma key and compose
a video, we have also seen some pros and cons of chroma key. And where it can
be used.
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