Pegg stars alongside friend and comedy partner Nick Frost as the Thompson Twins in Spielberg and Peter Jackson's long-in-development adaptation of Hergé's comic strips.
Speaking to the Christian O'Connell Breakfast Show on Absolute Radio, Pegg said: "Steven Spielberg has had the rights to Tintin since 1982 I think.
"After he did Raiders [of the Lost Ark] he was doing the European press, and people said 'It's a bit like Tintin isn't it?', and he didn't know what Tintin was, so he investigated, fell in love with it, and he's waited until he's been able to do it like Hergé's drawings, you know - he's waited for technology.
"So now it's like he can do Tintin as it was supposed to be seen, and it really is extraordinary. I'm really looking forward to it."
Frost explained: "They're very aware that they need to keep it true to Hergé's original concept."
Of filming in motion-capture, Frost added: "Well it is hard, but you get into it, you know, and it's kind of like rehearsing a play isn't it? That's what it feels like.
"You have to pretend, you have to do a lot of pretending. So there's nothing there, you know - it's a massive kind of grey room called The Volume, and there's like a thousand cameras watching you.
"You have like a suit on with loads of dots, and you have a helmet with a camera, and they just record your every movement."
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