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Chroma Key RGB Value
Going to shoot a short spot with a person talking straight to camera with a TV behind her. The camera will be doing some slow dolly moves, nothing too big.
I need to generate a blue color and feed it to the TV Screen via DVI>HDMI from a Computer.
What is the correct/best RGB values to generate this in Photoshop?
We just need an image of a clean blue image that we can feed the TV. Shooting on Red, working with ProRes 444.
Been searching the net, can’t seem to find an answer.
Thanks
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3 Replies
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Good question, I believe the screen that we’re using has is an anti glare HDTV.
Most of the shots we’re using will have elements within the frame that we can use to track. The screen will not leave the frame or anything.
But, isn’t there a numerical RGB value that is best suited for keying? Particularly with After Effects?
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The colors best suited and most used for keying are the pure colors. If you’re using blue, the RGB values would be:
R – 0
G – 0
B – 255If green screen then:
R – 0
G – 255
B – 0 -
I’m going to disagree with all of you here. Although a “perfect”(0,255,0) greenscreen makes it easy to pull a hard-edged matte, the extreme luminance in the green channel will overwhelm the subtle edge details from your original photography, and the absence of any red or blue component in the fringe areas (hair, blur) will really mess you up when it comes to neutralizing the green spill. Based on experience, I’d recommend shooting greenscreens with a camera/light setting that results in a green area reading around 25,130,10 , and 30,70,160 for shooting a bluescreen.
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