Film-Tech Forum ARCHIVE: Has anybody seen Dolby Digital 3D in action?

my profile | my password | search | faq & rules | forum home

»	Film-Tech Forum ARCHIVE » Community » Film-Yak » Has anybody seen Dolby Digital 3D in action? (Page 2)

This topic comprises 2 pages: 1 2

Author

Topic: Has anybody seen Dolby Digital 3D in action?

Bobby Henderson
"Ask me about Trajan."

Posts: 10973
From: Lawton, OK, USA
Registered: Apr 2001

posted 11-23-2007 12:11 AM

Real D glasses look like Ray Ban Wayfarer glasses. The frames are black plastic with decent build quality. The lenses are thin plastic that can bend a little when pushed with a finger. These glasses are a step up from the cardboard glasses I got when seeing 3D movies in the 1980s.

I think Real D should put out a batch of red colored glasses when U23D is released.

| IP: Logged

Ray Faultless
Film Handler

Posts: 96
From: Amington, Tamworth, England
Registered: Jun 2001

posted 11-23-2007 04:48 AM

Over here the glasses are not collected after the show.We pay an extra £2 to see Beowulf which I thought was for the glasses.They come in a sealed plastic bag.

| IP: Logged

Chris Slycord
Film God

Posts: 2986
From: 청주시, 경북도, South Korea
Registered: Mar 2007

posted 11-23-2007 07:25 AM

That's likely because you saw it in RealD and not Dolby's 3D.

| IP: Logged

Mark Gulbrandsen
Resident Trollmaster

Posts: 16657
From: Music City
Registered: Jun 99

posted 11-23-2007 08:30 AM

quote: Hillary Charles
Is there any word about these "flicker" types of 3D triggering epileptic seizures? Or are they completely safe for epileptics?

That reminds me of my neighbor back in the Midwest whose 60 hz flickering computer monitor caused her to have epileptic seizures. Her doctor couldn't figure it out and I finally one morning hit the nail on the head as she had called us and was sitting in front of her computer when she had a seizure, I heard the phone hit the floor and I called 911... raising the monitor scan rate to 72 hz brought an end to the computer induced seizures! I will call and see if she has been to see any of these 3-D films....

Mark

| IP: Logged

Hillary Charles
Jedi Master Film Handler

Posts: 748
From: York, PA, USA
Registered: Feb 2001

posted 11-23-2007 09:46 PM

Mark, that story is exactly why I am concerned. You never really know what will trigger those seizures.

Yesterday, one of my relatives told me that she and her daughter saw "Beowulf" in 2D and would like to see it in 3D. Since it doesn't appear the local IMAX is planning to run it, we're hoping to see it in digital 3D. She is epileptic (and her daughter has shown signs of it), and my fear is that the alternating left/right flicker could trigger a seizure. I'd like to take them to the 3D version, but would feel awful if anything like this would happen.

| IP: Logged

Tim Reed
Better Projection Pays

Posts: 5246
From: Northampton, PA
Registered: Sep 1999

posted 11-23-2007 10:19 PM

I will get some kind of trip-out seizure at certain rough textures or patterns, if I'm not careful. I have to look away and put it out of my mind, or do an exceptional job of ignoring it.

When I worked at Hadden, I had to be especially careful not to stare at the stacks of rough, cardboardy, peaky, triangular corner-protectors that came with the Middle Atlantic racks. [Eek!]

Like THIS! (I can't look at this for long, particularly should it be flipped top to bottom, or I'm a goner..) Sounds crazy, I know. But at least I know what to AVOID!

| IP: Logged

Joe Redifer
You need a beating today

Posts: 12859
From: Denver, Colorado
Registered: May 99

posted 11-24-2007 12:40 AM

quote: Tim Reed
I can't look at this for long, particularly should it be flipped top to bottom

Do you mean if that picture you posted were upside down, you'd trip out?

| IP: Logged

Mark Gulbrandsen
Resident Trollmaster

Posts: 16657
From: Music City
Registered: Jun 99

posted 11-24-2007 09:31 AM

quote: Hillary Charles
Mark, that story is exactly why I am concerned. You never really know what will trigger those seizures.

Yesterday, one of my relatives told me that she and her daughter saw "Beowulf" in 2D and would like to see it in 3D. Since it doesn't appear the local IMAX is planning to run it, we're hoping to see it in digital 3D. She is epileptic (and her daughter has shown signs of it), and my fear is that the alternating left/right flicker could trigger a seizure. I'd like to take them to the 3D version, but would feel awful if anything like this would happen.

I would make a call to Dolby on that one for sure... 415-558-0200 and find out the exact flicker frequency and I would think that as long as its out of the normal perception of human sight that it would be ok. They might also be interested in any feedback from your friend after you all see the film.

From my experience with my next door neighbor I would say that the flicker definately needs to be higher than 60 hz. I will try to contact a local friend today that is in charge of the two Dolby 3-D systems here in SLC and see if he can also give me any pertinant data for you. An attack would definately be awful to say the least because depending on how bad the seizure is it can also mean hospitalization and so on.

Mark

| IP: Logged

Bill Enos
Film God

Posts: 2081
From: Richmond, Virginia, USA
Registered: Apr 2000

posted 11-24-2007 12:19 PM

Anybody know what process is used by Busch Gardens in their 3D rides. I've been on the Dark Castle ride at Busch Gardens Williamsburg and found the 3D effects to be very good though for the most part there was little color.

| IP: Logged

Hillary Charles
Jedi Master Film Handler

Posts: 748
From: York, PA, USA
Registered: Feb 2001

posted 11-24-2007 01:14 PM

Mark, Thanks for the number and whatever info you can find. I know the mother is on medication to control her epilepsy, but that's never 100%. Even driving through trees that intermittantly block the sun can trigger a seizure, if the speed of the car is just right. And once that happens, her driver's license can be suspended for two years, a rule that is not convenient, but is totally reasonable.

And Tim, I've never heard of your condition before, but the idea of certain patterns causing problems makes sense. The rough textures aspect seems very unusual. Is it?

| IP: Logged

Tim Reed
Better Projection Pays

Posts: 5246
From: Northampton, PA
Registered: Sep 1999

posted 11-26-2007 09:08 AM

Hillary, yes, I suppose so. It's more the patterns that the ridges of a rough texture form (out of negative space, maybe - I'm can't look at them long enough to determine without "stepping off the precipice"). It's just something that happens with me. It's bizzare, I know. I always figured it might be associated with epilepsy. Thankfully, I haven't had "an episode" in probably 15 years.

When I was 16 or 17, I was having seizures regularly for several months (once, while driving!). The doctors ran all kinds of tests on me: EKG, brain scan, etc... but never pinpointed what was causing them. Since then, I've felt them "coming on" at these certain patterns. It's very scary.

quote: Joe Redifer
Do you mean if that picture you posted were upside down, you'd trip out?

Judging from the feeling I get by that photo (which I found randomly on Google images), yes, I'd be more prone to be "affected" by it, if it were inverted. It very much resembles the Middle Atlantic rack corner protectors that I had to avoid.

| IP: Logged

Mark J. Marshall
Film God

Posts: 3188
From: New Castle, DE, USA
Registered: Aug 2002

posted 11-26-2007 10:26 AM

Wow, Tim. That has to be a strange feeling.

| IP: Logged

Dave Macaulay
Film God

Posts: 2321
From: Toronto, Canada
Registered: Apr 2001

posted 11-27-2007 10:13 AM

There should be about the same amount - or less - flicker from a digital 3D system as with a film projector.
I understand Digital 2D systems don't flicker like film projectors as they don't need the long "dark" time the intermittent takes to move a film frame, they blank for a very short time when refreshing the frame image and each pixel has a different ON time depending on its brightness... I'm probably wrong in some way but that's my interpretation of what I've read about the TI system. 3D would presumably have to blank for a while when the filter wheel is between sides, so it might have more flicker than 2D.
The seizure inducing effect from flashing lights (especially strobes) is strongest at about 3 Hz and very weak (basically zero) at the 48 Hz flicker rate of standard film projection.
We built a strobe in high school and one kid was really interested in it, he held it in his face and stared directly into the reflector for about 10 seconds before falling down and having a massive seizure. We (his classmates) didn't know he had epilepsy before that. It was flashing at just about exactly 3 Hz as the circuit was weak and above that rate it would get progressively dimmer.

| IP: Logged

Bobby Henderson
"Ask me about Trajan."

Posts: 10973
From: Lawton, OK, USA
Registered: Apr 2001

posted 11-27-2007 10:25 AM

There should be no noticeable flicker at all with "digital" 3D. Real D triple flashes each left eye and right eye frame alternately. Unless your eyesight can somehow see well above 72 frames per second (and you have a lack of persistence of vision) you should not see any flicker.

| IP: Logged

All times are Central (GMT -6:00)

This topic comprises 2 pages: 1 2

Printer-friendly view of this topic

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.