Chroma Keying
Chroma key compositing, or chroma keying, is a visual effects technique for compositing (layering) two images of video streams together based on color hues (chroma range).
The technique has been used heavily in many fields to remove a background from the subject of a photo or video – particularly the newscasting, motion picture and videogame industries.
A color range in the foreground footage is made transparent, allowing separately filmed background footage or a static image to be inserted into the scene.
We will use a similar technique to replace a green screen background from a video and replace it with a background of our choice and blend the two in effect.
The original video to be used by us is :
Here we will remove the background greens and replace it with the this background :
to begin with we use a software called nuke and in nuke we use ibkcolor and ibkgizmo to remove the greens from the background and we are left with an extracted video
the output still has traces of greens around the characters edges
In order to remove that we use a erode node(Dilate) with a combination of premult node and we end up with a result which is something like this
we add a little color correction and blur to reduce the spills and to tone the character and we have a chroma keyed video
Now we add in the background that we wanted to place before hand and merge the two together
We still have the markers which were there in the green screen videos so in order to remove them we do masking and remove them and we end up with the final result of the two videos
now we finally go through the nodes and see our complete composition
the final composition is as follows:
hope you like it!!!
Till next time keep animating and learning.
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