what's the difference between 3D and RealD? - AVS Forum
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post #1 of 19 Old 12-10-2010, 08:59 PM - Thread Starter
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This might be a little O.T. but a lot of movie previews say "now showing in 3D and RealD". What's the difference?
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post #2 of 19 Old 12-10-2010, 09:08 PM
 
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Quote:
Originally Posted by retroeric View Post

This might be a little O.T. but a lot of movie previews say "now showing in 3D and RealD". What's the difference?

There are five different 3D presentation systems used in the USA:

RealD
Dolby 3D
IMAX 3D
Digital IMAX 3D
XpanD Cinema

IMAX and RealD have good marketing departments and budgets.
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post #3 of 19 Old 12-10-2010, 09:32 PM
 
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Quote:
Originally Posted by retroeric View Post

This might be a little O.T. but a lot of movie previews say "now showing in 3D and RealD". What's the difference?

If you pay them enough you can get "now showing in retroeric3d" :-)

Mathew Orman
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post #4 of 19 Old 12-13-2010, 07:52 PM - Thread Starter
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Quote:
Originally Posted by Lee Stewart View Post

There are five different 3D presentation systems used in the USA:

RealD
Dolby 3D
IMAX 3D
Digital IMAX 3D
XpanD Cinema

IMAX and RealD have good marketing departments and budgets.

So there is no technical difference?
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post #5 of 19 Old 12-13-2010, 08:27 PM
 
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Originally Posted by retroeric View Post

So there is no technical difference?

No,
they are all technically different.
And they all have advantages and disadvantages.

Mathew Orman
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post #6 of 19 Old 12-16-2010, 06:27 AM - Thread Starter
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Originally Posted by icester View Post

No,
they are all technically different.
And they all have advantages and disadvantages.

Mathew Orman

So what are the differences?
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post #7 of 19 Old 12-16-2010, 07:16 AM
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The difference between 3d and reald is the difference between car and toyota. Reald is just one particular brand implementation of 3d.

Most of those implementations are polarized. RealD and possibly some of the others (I think Imax?) are circular, which makes them less sensitive to moving your head (though linear is higher extinction rate if you do keep your head still). Dolby is kinda the odd man out in that it uses color-coded notch filters. It has the highest extinction rate of them, but the image is color-skewed, so has to be color-corrected. As long as the color correction is done properly and the source lamp is bright enough to compensate for the reduction it should be the better of them due to the crazy-high extinction, but I've never seen it in the theaters so I don't know how well they usually implement the color corrections.

Honestly unless a theater screws something up, though, they should all give a user a great experience, and the differences should be of minimal impact.
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post #8 of 19 Old 12-16-2010, 04:08 PM - Thread Starter
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Originally Posted by defiancecp View Post

The difference between 3d and reald is the difference between car and toyota. Reald is just one particular brand implementation of 3d.

Most of those implementations are polarized. RealD and possibly some of the others (I think Imax?) are circular, which makes them less sensitive to moving your head (though linear is higher extinction rate if you do keep your head still). Dolby is kinda the odd man out in that it uses color-coded notch filters. It has the highest extinction rate of them, but the image is color-skewed, so has to be color-corrected. As long as the color correction is done properly and the source lamp is bright enough to compensate for the reduction it should be the better of them due to the crazy-high extinction, but I've never seen it in the theaters so I don't know how well they usually implement the color corrections.

Honestly unless a theater screws something up, though, they should all give a user a great experience, and the differences should be of minimal impact.

I guess what I am wondering is, if the differences are only technical and there is no different to the consumer, why the need for the movie's trailer to say things like "Coming soon, in 3D, and RealD!".
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post #9 of 19 Old 12-16-2010, 04:10 PM
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Because if the consumers think a particular format is better, they ask for it, and theaters then have incentive to adopt it.

Marketing: Reality is irrelevant, only perception matters


(I'm a marketer, I know )
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post #10 of 19 Old 12-17-2010, 07:12 AM - Thread Starter
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Originally Posted by defiancecp View Post

Because if the consumers think a particular format is better, they ask for it, and theaters then have incentive to adopt it.

Marketing: Reality is irrelevant, only perception matters


(I'm a marketer, I know )

Thanks!
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post #11 of 19 Old 12-17-2010, 09:40 AM
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Wow, no it's way different than that. It's more like a car vs a semi truck.

If I understand it, those passive RealD glasses are polarized glasses. I think they use 2 projectors on the same screen, one with a particular sort of light, and the inverse on the other. Either that or I think it's a single projector unit, but projecting two seperate images. You can't do that on a RP or a panel TV. So the glasses are more complex @ home.

The trade off I think is that the initial display equipment is way more expensive (which it always is with movie theater equipment), but the glasses cost but a mere fraction of the active glasses.

Look at it this way, I doubt really anyone on these forums can afford those movie theater projectors, nor would you want to (unless you're of the filthy rich type...)
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post #12 of 19 Old 12-17-2010, 10:53 AM
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No, it's exactly as I described. The OP didn't ask what's the difference between home 3d and theater 3d, he asked '... why the need for the movie's trailer to say things like "Coming soon, in 3D, and RealD!"', meaning he was wondering how RealD is different from other movie theater 3d implementations, and as I said before, it doesn't in any meaningful way: RealD is just a branding of one of several implementations of 3d that uses circular polarized.

And for that matter, home 3d is not exclusively limited to shutter glasses, there are plenty of implementations that use passive polarized glasses - I've used one myself - but that's not relevant to the topic.
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post #13 of 19 Old 12-17-2010, 06:38 PM - Thread Starter
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Quote:
Originally Posted by defiancecp View Post
No, it's exactly as I described. The OP didn't ask what's the difference between home 3d and theater 3d, he asked '... why the need for the movie's trailer to say things like "Coming soon, in 3D, and RealD!"', meaning he was wondering how RealD is different from other movie theater 3d implementations, and as I said before, it doesn't in any meaningful way: RealD is just a branding of one of several implementations of 3d that uses circular polarized.

And for that matter, home 3d is not exclusively limited to shutter glasses, there are plenty of implementations that use passive polarized glasses - I've used one myself - but that's not relevant to the topic.
Yeah I was just asking about the theater 3D, not home (hence the O.T. warning in the first post).

Thanks again everyone for the explanations.
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post #14 of 19 Old 12-17-2010, 11:47 PM
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Marketing!
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post #15 of 19 Old 01-03-2011, 11:46 AM
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Quote:
Originally Posted by defiancecp View Post
Because if the consumers think a particular format is better, they ask for it, and theaters then have incentive to adopt it.

Marketing: Reality is irrelevant, only perception matters


(I'm a marketer, I know )
That is a wonderful definition of marketing - I sent that one to a friend in my company's marketing department. An off-topic comment.. recently in a Dilbert strip, Scott Adams described marketing as "liquor and guessing".

Back to the topic - I wasn't sure of any real technical differences, so this is very interesting. I've saved my RealD glasses from the local theater so I could save the surcharge when I went back to see Tron. They recently installed an Imax projector, but they don't let you keep those. I've been told that they charge you extra for the 3D movies anyway even if you carry your glasses back, but I haven't tried it yet myself. Has anyone else tried that?
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post #16 of 19 Old 01-03-2011, 12:08 PM
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Originally Posted by Photokid1970 View Post

I've been told that they charge you extra for the 3D movies anyway even if you carry your glasses back, but I haven't tried it yet myself. Has anyone else tried that?

That's pretty much the whole purpose of charging you the 3D surcharge. Doesn't matter if you use your own glasses, it's the marketing cost of showing a "3D" movie. It's almost better if you keep those glasses - at least you get to take home a little something from the "theater" experience. 2D movies you just leave with sticky shoes and a sore butt
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post #17 of 19 Old 01-03-2011, 12:52 PM
 
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Quote:
Originally Posted by Photokid1970 View Post

That is a wonderful definition of marketing - I sent that one to a friend in my company's marketing department. An off-topic comment.. recently in a Dilbert strip, Scott Adams described marketing as "liquor and guessing".

Back to the topic - I wasn't sure of any real technical differences, so this is very interesting. I've saved my RealD glasses from the local theater so I could save the surcharge when I went back to see Tron. They recently installed an Imax projector, but they don't let you keep those. I've been told that they charge you extra for the 3D movies anyway even if you carry your glasses back, but I haven't tried it yet myself. Has anyone else tried that?

IMAX 3D glasses will not work with the new passive 3DTVs because IMAX uses linear polarization while RealD uses circular polarization (as do the new Vizio and LG 3DTVs).

And they don't reduce the price of a 3D ticket if you bring your own glasses.
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post #18 of 19 Old 01-04-2011, 01:51 PM
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Quote:
Originally Posted by defiancecp View Post

Because if the consumers think a particular format is better, they ask for it, and theaters then have incentive to adopt it.

Marketing: Reality is irrelevant, only perception matters


(I'm a marketer, I know )

LOL - It's kind of like the big advertising surge you used to see with THX certified cinemas. Another good marketing strategy. You marketing guys...

Interesting to note though that I just received a media player, the Dune HDI D1 and it advertises RealD compatibility so I guess they'll be offering streaming with their content for the home market, just FYI. Sorry to skew off topic even more but the marketing comment made me laugh and I had to reply.
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post #19 of 19 Old 01-05-2011, 03:52 PM
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The only IMAX 3D theater I've been to that let me keep the glasses was Jordan's Furniture in Natick, MA. They are the RealD style with linear polarized film instead of circular. They are also the only 3D theater I've been to (IMAX or RealD) that removes the $1.50 surcharge if you bring your own glasses. The adult price is also $11.50 for any movie (without 3D charge) which makes it cheaper than most other theaters....and it's IMAX!

3D surcharge for RealD is mostly due to the RealD Z-Screen and silver screen installation and most of the time the installation of a digital projector.
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