How did they film Patsey being whipped?
A Sequence in 12 Years A Slave shows Patsey, a plantation worker, being tied to a pole and whipped.
The shot is horrifying, and shows her flesh being torn and rendered open by the whip as it makes contact, cleaving chunks of flesh away.
Obviously they didn't actually whip Lupita Nyong'o, and from this interview we can determine that no actual contact was made with her body during the scene:
It’s all about the crack of the whip. You hear it. And you feel it. I felt the wind of it every single time. I didn’t need much more. That was one technical thing, and definitely it took some finessing because obviously I can’t see what’s happening. I can’t see the whip. I can only react to the sound and the wind of it, yeah? So it was hard, but that day was as real as it could have possibly been for me, because in preparing for it, all I could do was be present.
It's unlikely the shots were achieved by CGI, unless it's literally the best CGI ever used in cinema and Steve McQueen is incredibly humble about what he's achieved (those of you who have seen the movie will no doubt vouch for this, it's incredible).
But I can't understand how they could have been achieved practically without physically touching the actress, which she has stated didn't happen.
Another interviewer was, like me, utterly incredulous as to how this scene was shot and asked Nyong'o herself, but she only replied:
It feels, as the viewer, like it would've taken longer to achieve -- not only because it's one continuous shot, but because it's so emotionally heavy. Were those practical effects or CGI effects employed?
I don't feel like telling! [Laughs]
Does anyone with any practical experience of S/FX understand how they could have filmed this? Does anyone actually know how this was achieved?
Best Answer
(Not saying this is how it was really done - my background is in stage, not screen).
There are three effects going on there - the spray of blood from the whip, the (very brief) scene where you see the whip striking the actresses back, and the closeup of the wounds afterward.
In reverse order:
the closeup is basic prosthetics well within the abilities of a makeup student. They're a bit big - actual wounds of that scale would not have been survivable in that era.
the whip strikes don't need to be simulated. A layer of wetsuit neoprene can be applied (with a few pre-existing wounds on top) to take the quite weak hits of the whip. The recipient would barely notice. If you really want to lay it on you apply some plaster bandages under the neoprene. If you REALLY want to lay it on, make a body cast and use that to form a brass plate to her back (brass hand-forms easier than aluminum).
spray is easy. Put a sponge on her back or just use a mister filled with red water. Notice how much bigger the cloud is when filmed over her shoulder. CGI is even easier, just costs a lot more. Can't do CGI on stage.
All the above is a LOT easier to do on a black performer, especially with one as dark as Lupita Nyong'o. Because of the lower reflected light, lower contrast, the seams in the makeup just disappear.
Complements to the sound effect crew for avoiding the whip-crack cliche. Whips don't make the crack sound when they strike something.
We were such pleasant people back then.
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12 YEARS A SLAVE 2013 MOVIE SCENE : MASTER EPPS WHIPPING PATSEY CLIP
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Answer 2
BuzzFeed has an article that describes the process as a mix of practical effects and CGI.
Logistically, it was a matter of some old-school camera trickery — the whip never came close to Nyong'o's back, but it looked like it did thanks to the camera angles director Steve McQueen chose for the scene, and Nyong'o moving her body as if she was being whipped. And when the camera swings around to capture the ruin inflicted upon Patsey's back, the effect is a combination of practical make-up and CGI.
As for the actual mechanics of what practical effects they used... unknown. Hopefully there's an industry professional somewhere around here.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Georgie Devlin, Tatiana Fet, Collis, Kyle Loftus