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正在取代绿幕的技术

The technology that’s replacing the green screen

You know the green screen (and blue screen).
你肯定知道绿幕 还有蓝幕
You know it becomes the: Mist-covered planet, Deserted jungle
你也知道它可以变成雾气笼罩的星球 被毁灭的丛林
Background for a bar, Packed athletic stadium – Panoramic waterfall
酒吧的背景 拥挤的运动场 全景瀑布
What happens when the imaginary planet…is already there?
从想象中的星球到荧幕场景 其中发生了什么?
“The moment you step in the middle of the Volume,
当你走进“Volume”中间的那一刻
you’re just, you’re just there.”
你就……你就身处场景里了
“The Volume” is the epic sounding name
“Volume”这个史诗级名字
for the combination of high resolution LED panels
用于称呼高分辨率LED显示屏的组合
— imagine awesome huge TV screens wrapping around a stage —
想象一下 巨大的电视屏幕环绕着舞台
the physical set design matched to the panels,
物理布景设计得和显示屏相匹配
and 3D models plopped into an environment the same way they do in a video game.
而那些3D模型会像在电子游戏里一样落入场景中
Then it can respond to camera movement to simulate the real world.
这些模型还能响应摄像机位置移动来模拟真实世界
Disney +’s the Mandalorian, a live action Star Wars TV show, used this technique.
迪士尼+的星战系列网剧《曼达洛人》就采用了这一技术
“My name is Charmaine Chan and I’m a lead compositor at Industrial Light and Magic.
我是Charmaine Chan 工业光魔公司的首席特效合成师
工业光魔公司
视觉特效
最近的
Is it, is it physically, like, confusing being on this set?
请问 在这样的片场工作 是否会让你感到困扰?
“Oh absolutely, I mean, the thing is like you’re,
噢 当然 我是说
you’re shooting all day,
你一整天都在拍摄
Let’s say in the same exact scene
我是说在同一个场景里面
and like you’re at that location,
就像你真的在那个地方一样
it doesn’t feel like it’s something fake.
你不会感觉场景是虚构的
It just feels like the extension of a regular stage.
而像是普通舞台的延伸
You gotta be careful because there are times when people don’t see
你得小心 因为经常会有人
where the edge of the stage is and where the LEDs are.”
没注意到舞台的边缘以及LED屏幕所在
You have Wiley coyote and Roadrunner situations
有点像《BB鸟和歪心狼》里那样
where somebody is like running into the wall or something.
有人会不小心跑着撞到墙上
“Yeah. We, we definitely made sure
是的 正因如此
that no one’s running in that stage because of that reason.”
我们会要求在片场里不能跑步
Charmaine is credited as part of the Brain Bar –
Charmaine在片尾被称为“智囊团”成员
the group of visual effects artists that operated this system.
“智囊团”由操作这个系统的视觉效果设计师组成
One might adjust models, like a rock or spaceship, in the panels,
组内有人调整石头或者飞船之类的模型在屏幕上的位置
while another might tweak live animations, like a burning fire.
而另一些人需要布置动态效果 比如燃烧的火焰
Charmaine often adjusted color.
Charmaine的分工通常是调整色彩
“It was funny cause it, it looked very much like,
这项工作很有趣 因为它特别像
you know, back in the day when you would have
回到以前PBS播的那种
a telephone fundraising stuff like,
电话筹款的日子
on PBS and it was just like rows of people phone’s ready to go,
几排人随时准备着接电话
but instead of phones we had computers and our walkies.”
只是我们现在不用电话 而是电脑和对讲机
As Mandalorian VFX supervisor Ian Milham Tweeted,
正如《曼达洛人》的视觉特效监制Ian Milham在推特上说的
the set crew and Brain Bar operating the panels
当片场成员和操纵屏幕的“智囊团”
let them radically change environments in just a few hours or be on set…
把场景设置成多维空间
as they launched it into hyperspace.
可以在几个小时内彻底改变片场环境
“My normal working life is very much behind
之前我的工作一般是在某个小角落的办公室
the computer in a dark room, somewhere in the corner.
在昏暗的房间里操作电脑
Now I’m actually in there
而现在我会在片场
with the gaffer, with the prop designers, with the set designers,
和灯光师 道具设计师 布景师一起工作
most people that we would never see
他们中的大部分人我们都不会见到
because we’re in the post production process.
因为我们从事的是后期制作
It was very exhilarating.”
新的工作模式很令人兴奋
But sets like this one weren’t just fun for Charmaine.
但像这样的场景对Charmaine来说就不完全有趣了
They helped remove creative roadblocks.
因为他们需要帮助消除这些障碍
As a compositor, we’re the ones who kind of take all the renders,
作为特效合成师 我们负责所有的渲染
take all the CG elements and put them together
需要把所有的CG元素结合在一起
to make it look like it’s a seamless, integrated photo.
让它看起来像是一个无缝的整体画面
So think of it as like advanced Photoshop,
因此 我们可以把这项技术视为高级版的Photoshop
But we’re dealing with moving imagery.”
只不过我们处理的是动态图像
Charmaine worked on this scene in The Last Jedi.
Charmaine在《最后的绝地武士》处理了这个镜头
这个镜头是基洛在绿幕前拍摄的
If you’re lucky, this green screen will be evenly lit, with no seams.
幸运的话 这个绿幕的打光会是均匀 无缝衔接的
And it’s piece of cake. That’s never the scenario.
这样对后期来说就是小菜一碟了 但这完全不可能
We’re spending the time, almost frame by frame,
我们要花大量时间 一帧一帧地检视
making sure we can remove that green screen
以确保把绿幕全部移除
so that we can put Kylo on top of that.”
才能让特效完美地出现在基洛后方
Removing a green screen is actually still pretty hard.
移除绿屏现在实际上还是很困难的
For one, it doesn’t work with green characters.
首先 不适用于绿色的角色
“Yoda’s green.”
尤达是绿色的
Removing one solid color — or “keying” can look good,
移除纯色 或者叫“抠像”看起来挺好
but you still need detail work.
但你仍需要对细节进行调整
See how these fine branches just disappear.
看看这些细枝是怎么消失的
The perspective of the background also doesn’t naturally change –
背景的透视关系也无法随之自动改变
that has to be designed into the final composite.
必须在最后合成时进行调整
Ditching the greenscreen and projecting or playing the image behind the actors….
放弃绿幕而改为在演员背后投影或播放图片
会更让你感觉到场景真实
不过远不止于此
You can get detail and an illusion of depth and better light.
你能得到更多细节 更好的景深和优质的的光线
Instead of green screen spilling on the actor,
不同于让绿幕的颜色溢出在演员身上
you get blue sky, and red desert actually lighting them.
照亮他们的是蓝色的天空和红色的沙漠
That basic technique has worked in everything from 2001 to Oblivion,
从《2001太空漫游》到《遗落战境》 这项基础技术应用于各个方面
but you miss the proper perspective shift, or parallax, in the background,
但你没法让背景随视线调整 或者说得到正确的视差
since it’s just a video playing on a screen.
因为它只是在屏幕上播放的视频
The volume tackles some of those problems.
“Volume”解决了其中一些问题
You can also adjust light and objects on the fly.
你可以调整光线和画面中的物体 还能营造反射效果
because they are reflecting the other screens instead of green screen –
因为他们反射的是来自其他屏幕的光线 而非绿幕的光
which was especially important for Mando —
这一点对剧中的主角——
the show’s main character.
曼达洛人非常重要
“His whole armor was reflective from head
他的整个盔甲 从头到脚都是反光的
to toe, whether it be his pauldron or his helmet, it was just like,
无论是它的盔甲还是头盔 总之
you can’t avoid seeing things being reflected.
你无法避免地会看到光线被反射
So creating this volume where we literally could close up the whole thing into one giant circle
而“Volume”能让我们把所有东西放进一个大圆环中
and have an environment all across these screens.
然后通过这些屏幕创造光线环境
We were getting exactly what we wanted to out of his helmet.”
从而得到我们在头盔上想要看到的效果
The brain bar could focus on details that made the final product as seamless as possible
“智囊团”专注于细节 使成片尽可能没有瑕疵
— which was still a lot of work.
这个工作量也很大
“I would go in and whether it be a rock or a barrel or something,
我会检视片场 不管是一个石头或者桶 还是别的什么
I would try to color correct it to match what was on the set.
我都会试着对其颜色进行修正 使其和片场颜色相匹配
But where color correction was more important
但对于颜色校正而言
was when we’re dealing with the bigger parts of the sets.
更重要是处理片场里的较大部分
So whether that be the dirt on the ground versus dirt in our digital scene.
比如将地上泥土的颜色和虚拟背景里泥土的颜色相匹配
And the lighting from the scene affected the dirt on the ground.
而背景屏幕的光线又会影响地面泥土的颜色
So we would have to like,
所以我们又得……
because we had a blue sky and suddenly now there’s all this blue on this rock.
因为天是蓝色的 所以此时这块石头上会有蓝光
We would have to color correct the ground and the rock
所以我们又得修正地面和石头的蓝色
to also have just as much blue as the blue that we just introduced.
来保证它们的色调与刚才我们提到的环境匹配
Before they started shooting, I would have. Five to 10 minutes
在拍摄前 我会有5到10分钟
to have that all lined up and ready to go.”
来进行这些工作 准备开拍
I can imagine that, that there are some creative
我能想象有很多创造性的突破
breakthroughs that this makes possible for, for your job.
让你的工作有了新的可能性
What would those be with this technology?
这些技术会带来什么影响?
“I’ll be honest. I would not be mad if
说实话 即使我以后再也不用做绿幕抠像或特效
I never have to do a green screen keying or extraction ever again.
我也不会感到生气
Now I get to be a person who’s doing the shot
因为现在我是一个真正在参与拍摄的人
and I can help basically finalize a shot in camera.
我能帮助他们在镜头前完成拍摄
It just makes it a more cohesive filmmaking process,
这让整个电影拍摄过程更加流畅了
and this puts us right in there next to everyone else
而且这项技术也让我们和其他制作节目或电影的人一起
who’s creating these shows or films.”
参与到制作过程中去
威瑞森电信出品
It was great to talk to Charmaine
这是一次和Charmaine的精彩对话
and learn a little bit about her work and some of the amazing things that she’s worked on.
让我对她的工作 还有她超棒的工作成果有了一定的了解
This video is actually from a sponsor, which is Verizon.
本视频由威瑞森电信赞助播出
They just turned on 5G Nationwide.
威瑞森电信最近开通了全国5G服务
So with 5G Nationwide, and in more and more cities
随着5G在全国范围内越来越多城市的普及
you get the unprecedented performance of 5G Ultra Wideband.
您将获得前所未有的5G超宽带性能
It’s really fast, the world’s fastest 5G.
网速确实很快 是世界上最快的5G
You can download an album in a few seconds.
您只需要几秒就能下载一个专辑
It’s not just gonna change your phone, it’ll change everything.
它不仅会改变你的手机 还会改变一切
I’m guessing that a lot of creative breakthroughs will come from it too.
我猜未来它还会带来很多创造性的突破
So this is the 5G America’s been waiting for, and it’s only from Verizon.
这就是美国一直在等待的5G 由威瑞森电信独家提供
Verizon doesn’t directly impact our editorial,
威瑞森电信没有直接介入视频编辑
but their support makes videos like this possible.
但他们的支持使此类视频得以播出

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视频概述

通过Volume技术打造新型片场虚拟布景 突破绿幕抠像局限

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视频来源

https://www.youtube.com/watch?v=8yNkBic7GfI

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