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How Do They Do It???

Posted: Tue, 4th Jan 2005, 1:31pm

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TommyB

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Hi,

I was wondering if anyone knows how certain effects are done in these movies.

1. Harry Potter II
There is a flashback where everything is sepia, except Harry who is in full colour? Is there an easy method I'm not thinking of?

2. Harry Potter III
At the end the two kids go back in the time and watch themselves. Static shots of cloning are easy, but this one involved a complex camera movement which had both of them cloned in the same shot?

Cheers,
Posted: Tue, 4th Jan 2005, 1:42pm

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Simon K Jones

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1. There's loads of ways to accomplish this, so who knows which one they went for. In DigiGrade, for example, you'll be able to easily select areas of the screen and change their colour grading individually.

2. Most likely used motion control cameras, which enable you to replicate a complex camera move precisely, as the movement is handled by a computer. So you can film the actors in different locations each time, then it's just a simple matter of comping the different shots together.
Posted: Tue, 4th Jan 2005, 1:52pm

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Waser

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Tarn wrote:

In DigiGrade, for example, you'll be able to easily select areas of the screen and change their colour grading individually.
surprised
Posted: Tue, 4th Jan 2005, 2:28pm

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TommyB

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Tarn, is there no way for a programme like DigiGrade to detect movement and apply effects it?
Posted: Tue, 4th Jan 2005, 2:33pm

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Simon K Jones

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Motion tracking is something we might look into at some point, although it isn't a major priority. Tracking miniDV footage (or worse) is rather tricky, as the low resolution results in very little information. This is compounded if the video is not filmed correctly. Film, on the other hand, is much clearer and of higher resolution, making tracking much easier.
Posted: Tue, 4th Jan 2005, 5:05pm

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TommyB

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Yeah... I hate working with MiniDV. It's difficult to do fancy things in 3D programmes as the footage is so horrible and grainy.

I hope I can get my hands on HDTV equipment. By the way, do you know what you need to capture HDTV footage on to a computer?

Cheers,
Posted: Tue, 4th Jan 2005, 5:10pm

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boffa86

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TommyB wrote:

Yeah... I hate working with MiniDV. It's difficult to do fancy things in 3D programmes as the footage is so horrible and grainy.

I hope I can get my hands on HDTV equipment. By the way, do you know what you need to capture HDTV footage on to a computer?

Cheers,
probably some updated version of premiere or pinnace software youll get for free of something and im 100% sure HDcam are gonna use firewire
Posted: Tue, 4th Jan 2005, 8:53pm

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TimmyD

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You can apply a sepia tone color to the footage. Then in chromanator or *Alam Dv 3* import the sepiaed footage and the untouched footage, make a mask around the person, invert it, and there you go. I think Tarn was right about the motion control cameras for the time sequence...

Last edited Wed, 5th Jan 2005, 8:31pm; edited 1 times in total.

Posted: Tue, 4th Jan 2005, 9:48pm

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Marek

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timmyd wrote:

You can apply a sepia tone color to the footage. Then in chromanator of *Alam Dv 3* import the sepiaed footage and the untouched footage, make a mask around the person, invert it, and there you go. I think Tarn was right about the motion control cameras for the time sequence...
I think you just restated what Tarn said.

And just for reference, Chromy, and I'm presuming DV3 have small color grading tools, but it would be much better handled in Digigrade, as it is specifically geared toward grading and the like.
Posted: Tue, 4th Jan 2005, 9:49pm

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Simon K Jones

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Indeed. Not only will DigiGrade have a load more tools and filters, it'll be much easier to apply them, as the whole interface is geared towards that, without any faffing about.
Posted: Tue, 4th Jan 2005, 11:25pm

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Mellifluous

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1. Chromanator & After Effects can do this, with Chromanator being the cheaper option. Basically, you have 2 identical layers on the timeline. You make one layer totally sepia & then with the other normal footage you just create a mask around your character so that it excludes everything else (thus the character is in full colour).

2. Motion control, as others have said, although you may be able to experiment by applying artificial panning/zooming in your footage (depending on your video editor)
Posted: Tue, 4th Jan 2005, 11:34pm

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Evman

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I think some of the more complex shots in HP3 were just done with body doubles. That is, when their older selves are farther away.
Posted: Wed, 5th Jan 2005, 7:55pm

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TimmyD

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Mellifluous wrote:

1. Chromanator & After Effects can do this, with Chromanator being the cheaper option. Basically, you have 2 identical layers on the timeline. You make one layer totally sepia & then with the other normal footage you just create a mask around your character so that it excludes everything else (thus the character is in full colour).

2. Motion control, as others have said, although you may be able to experiment by applying artificial panning/zooming in your footage (depending on your video editor)
That is the 3rd time that has been restated. eek
Posted: Wed, 5th Jan 2005, 8:27pm

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Mellifluous

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Oooooh er...

Reading the above posts, it didn't seem as if the other explanations were clear enough, especially since you said

Then in chromanator of *Alam Dv 3*
This seemed a bit confusing, as Chromanator is of CSB Digital & AlamDV3 isn't even out yet. Plus I thought I'd state an explanation that utlises Chromanator/After Effects, which answers the question, intead of talking hypothetically about doing it in Digigrade, which also isn't out yet
Posted: Wed, 5th Jan 2005, 8:32pm

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TimmyD

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Sorry, it was a typo. I meant or. And i meant when ADV3 comes out.
Posted: Thu, 6th Jan 2005, 9:26am

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03ruby

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Or you can do it the cheaper way!!!
If your a student you should have access to mac flash you can import your video put a brown faded sqaure over the video and cut out the bits that you dont need and leave them to shine through then export to whatever size you want. but remeber to use quicktime if its flash 5 or earler or compressed if it is flash mx
problem is it cant be too big otherwise the program will crash and you get a message from the aminastrater like i did biggrin
Posted: Thu, 6th Jan 2005, 11:17am

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TommyB

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So in HP they would have drawn a mask around him for EVERY frame?

Surely there's an easier way?
Posted: Thu, 6th Jan 2005, 2:46pm

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Mellifluous

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No there isn't. Keyframing helps, e.g. creating a mask, then dragging the timebar to a point further along the timeline, adjusting the mask, & so on - but you still have to tweak each masked frame a bit so that it's perfect.
Posted: Thu, 6th Jan 2005, 2:50pm

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Simon K Jones

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I don't know the shot in question, but they might have used greenscreen or a difference key of some kind as well.
Posted: Thu, 6th Jan 2005, 2:57pm

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03ruby

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no they prob masked every key frame cos they need to get it perfect being a blockbuster and all
Posted: Thu, 6th Jan 2005, 3:13pm

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Simon K Jones

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Greenscreen is used quite a lot in blockbusters too. smile
Posted: Thu, 6th Jan 2005, 3:26pm

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Pooky

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Indeed, it's either hand drawn mattes or green/bluescreening, as you can't just tell the computer to mask a person by itself with nothing to base itself on, because all it sees is a bunch of dots of different colors (pixels). It can't tell that something is a person and another thing is not, simply because that would call for highly advanced AI.
Posted: Fri, 7th Jan 2005, 11:05am

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TommyB

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When they play that game - Quidditch or something? - is the entire thing just greenscreen angles?

Surely they'd have to do the multi-camera matrix thing? Because during the game there are thousands of angles of the same single character.
Posted: Fri, 7th Jan 2005, 12:47pm

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Pooky

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Sure, it was pretty much all on a greenscreen when they're flying. Dont forget that turning the actor around in mid air can be made to look like the camera is turning around him once you have the background plate added.
Posted: Fri, 7th Jan 2005, 1:41pm

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Simon K Jones

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Quite a bit of it was digital doubles, too. It's pretty awful, too, in the first film. In fact, most of the effects in the first film seem unfinished, very strange for such a major film. The third film, on the other hand, was beautiful.
Posted: Fri, 7th Jan 2005, 2:56pm

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er-no

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It's all greenscreen where close ups are concerned.

One of my old college friends got the role as the Slytherin Keeper and told me about how the first film was majority greenscreen and how they blew a huge fan in his face and well.. threw him about a lot.

Simply stuff, really smile
Posted: Fri, 7th Jan 2005, 3:07pm

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TommyB

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Quite a bit of it was digital doubles, too. It's pretty awful, too, in the first film. In fact, most of the effects in the first film seem unfinished, very strange for such a major film. The third film, on the other hand, was beautiful.
Yeah... I thought the third film was visually fantastic.

How exactly do you mean unfinished?
Posted: Fri, 7th Jan 2005, 3:08pm

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Simon K Jones

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Quite a few effects seemed well below ILM's usual standard, and there was one shot that was just plain wrong - it's when the kids are heading over to Hagrid's hut, and the school is in the background. Looks very, very odd.
Posted: Fri, 7th Jan 2005, 3:17pm

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TommyB

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Was it the same company who worked in the 3rd?
Posted: Fri, 7th Jan 2005, 8:41pm

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Evman

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Tarn wrote:

Quite a few effects seemed well below ILM's usual standard, and there was one shot that was just plain wrong - it's when the kids are heading over to Hagrid's hut, and the school is in the background. Looks very, very odd.
Yeah, I don't know whats wrong with it, but I remember that shot. All the effects in that movie didn't really have textures. The talking hat, the digital doubles in quidditch... even the dog looked washed out.
Posted: Sat, 8th Jan 2005, 12:36am

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TimmyD

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I would NEVER be able to do that Quidditch scene. That was so intensley populated with all the angles and such, i wouldnt be able to even start to organize it.

EDIT: Damn, new page. unsure
Posted: Tue, 11th Jan 2005, 7:05pm

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TommyB

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How in HP3 did they do the scene where the magic buss squished between the two double deckers?

Timmy, the Quidditch scene is easy as long as you're organized and you plan out EVERY SINGLE shot in advance. They will most likely have done the whole scene in basic 3D (forgot what it's called) with simple CG characters. This gives them a reference/idea as to what it'll eventually look like.