I have a question regarding the chroma shot.
The first is, when there is a shot with fire, what color chroma screen should I set up and take the background?
For example, a person holding a candle…
There’s no problem when the boundaries of fire are clear
I think it’s going to be a problem when the boundaries aren’t clear or Glow is strong
I’m curious about the synthesis process at times like this.
Second. In the water purifier commercial, we take a lot of close-up shots
There are many times when you have to synthesize the background of the various materials that you have been filming.
I’m wondering if I should take the water shot on the green screen or on the black background even in this case, and if it was one of the two, I’m wondering how best to synthesize it. It’s even better if you have a related tutorial!
The English is very awkward because it’s a question that was translated by a translator.
Answer me, experts!
Keying fire elements and transparent liquids like water is quite complicated. Every Flame artist here will have a different opinion on how to shoot it. A lot depends on the composition of the shot and also on your keying capabilities.
If you have only fire and objects that are easy to isolate using a green/blue screen, then go with green and try to use an advanced keying technique. Like IBK and/or additive keyer.
Shooting on black will give you nice edges but you’ll have to mask a lot of foreground elements.
Here are some great keying tutorials, not specifically with fire or water but still… This is a playlist created by a Korean Flame artist and it covers all the great Flame keying tutorials.
Water over black equals a bad time, since you lose all the mid tones. Do you know what the background is?
Typically you can’t shoot fire on green because to expose the green correctly would over expose the fire. For this reason, fire is typically shot over black very stopped down to protect the exposure.
I’d shoot water on a middle gray screen. There’s no way to key it anyway since water is clear, but with middle gray you’ll get the whole refracting and reflecting tonal range and no color added.
Then you roto it.
Now, since you ARE rotoing the water, you could also consider putting a version of whatever you want refracted through the water as the BG. That’ll look nicer in comp, but won’t work as well as a general purpose element.