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How do I chromakey an object in a video to change colour but preserve luminance?
Hi everybody,
I am hoping some of you will be able to help out with this little problem. What I am trying to do is chromakey an object in a video that is in the foreground. This object is a wooden sphere (painted in the chromakey). I would like to change the colour of this sphere (the hue and saturation) while preserving the luminance (the value).
The sphere is lit naturally and the shading allows for the object to be perceived as a 3D object, which is important for my project. The video footage is essentially the camera looking at this sphere from different perspectives. Thus, the shading changes throughout the video. Creating a mask with normal chromakeying would diminish that perception, as the shading would not be present or it would look unnatural.
Any advice or guidance would be really helpful. I’d be happy to answer any questions should something be unclear. Sorry if this is a noobie question. I’m quite new to all of this. Thanks you!
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3 Replies
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I’m by no means a Premiere pro expert, but I think, once the thing is keyed, I’d make a compound clip of the keyed element and then lumetri should be able to change the colors of it independently in that “container” while maintaining the shadow and details and leaving the original green screen matte unaffected. Second way to go would be to duplicate the track, colorize the underlying one, draw a feathered circle mask around the ball on the top layer and match-move it, or, third way, using the color tools, try the “Pleasantville” effect of sorts by using the color picker tool to change only the specific color used on the ball.
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From what I gather, the sphere is the only chroma key item in the shot, correct? What Mark says would work.
I’m thinking the easiest thing to do is duplicate the track, so your video is on V1 and V2. Chromakey the V2 track to cut out the sphere. Then add lumetri color to V1 to adjust the sphere colors to your liking.
Second, the Pleasantville effect that Mark suggests should work as well.
Good Luck!
TC
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Mark and Todd, you guys are legends. I ended up using the lumetri colour tools to change the sphere on one track, while adding a key mask to the other track. The end result is exactly what I wanted. I will try to test out the other suggested methods as well, just to learn a bit more. Thanks so much for the advice!
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