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Author Topic: Imax Digital
Tristan Lane
Master Film Handler

Posts: 444
From: Nampa, Idaho
Registered: Feb 2002


 - posted 10-30-2008 12:29 AM      Profile for Tristan Lane   Email Tristan Lane   Send New Private Message       Edit/Delete Post 
quote: Mark J. Marshall
I'm sure you might be correct.
You may be right in your assumption that I might be correct.

In all fairness.... It wasn't until recently seeing non sequential digital projector 3D that I've noticed "something" better about it. So... you might be right about the whole eye sync issue, but I'm not fessing up to anything! And I don't see anything visually to indicate a left eye/right eye lag issue. But I will admit that the non sequential 3D caused less eye strain and looked more natural. [evil]

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Fred Tucker
Film Handler

Posts: 90
From: Sugar Land, TX
Registered: Sep 2007


 - posted 11-01-2008 09:39 PM      Profile for Fred Tucker   Email Fred Tucker   Send New Private Message       Edit/Delete Post 
I have only seen a couple of D trailers so far on my digital IMAX, the 3D is far more impressive then RealD. It is more realistic and the 3D effect comes out much much further.

quote: Bobby Henderson
It's not even 4K. More like half that pixel count.

A true 4K image measures 4096 X 2160 pixels. A pair of Christie 2K digital projectors will show something along the lines of 2160 X 2048 -if even that.

Actually it would be a fourth since the pixels are stacked on top of pixel. IMAX says multiple projectors are used to increase brightness & contrast. Brightness is true but contrast is [bs] !

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16657
From: Music City
Registered: Jun 99


 - posted 11-02-2008 09:02 PM      Profile for Mark Gulbrandsen   Email Mark Gulbrandsen   Send New Private Message       Edit/Delete Post 
In order for this to work they'd have to be doing an alternating even/odd frame thing... overlaping pixels would normally cause a big drop in resolution. In order to do the even odd thing which would be similar to 2-projector 3-D they may also have to run the DMD's at high flash rate.

Mark

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Fred Tucker
Film Handler

Posts: 90
From: Sugar Land, TX
Registered: Sep 2007


 - posted 11-03-2008 11:59 PM      Profile for Fred Tucker   Email Fred Tucker   Send New Private Message       Edit/Delete Post 
Mark,
Are you saying that they are double flashing to increase resolution? If you are then I'm afrid you're incorrect on this one. Eagle Eye content is infact 4k but any and all data beyond 2k resolution is thrown out by the Doremi server, per IMAX. I asked that question specifically to our represenative and ended up talking with one of their engineers. Both projectors (while in 2D mode) are playing the exact same content at the exact same time & in the exact same place.

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Cameron Glendinning
Jedi Master Film Handler

Posts: 845
From: West Ryde, Sydney, NSW Australia
Registered: Dec 2005


 - posted 11-04-2008 02:41 AM      Profile for Cameron Glendinning   Email Cameron Glendinning   Send New Private Message       Edit/Delete Post 
quote:
Brightness is true but contrast is !

Quick question
Are the ports and len's crystal clean? the reason I ask is that with film or digital basics like these can also be contrast killers.

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16657
From: Music City
Registered: Jun 99


 - posted 11-04-2008 08:27 AM      Profile for Mark Gulbrandsen   Email Mark Gulbrandsen   Send New Private Message       Edit/Delete Post 
quote: Fred Tucker
If you are then I'm afrid you're incorrect on this one.
Either flashing or alternating projectors... I don't see any other way they could be doing it... without ending up with a ghost or smeared image that would more or less lower the resolution. Think about it..... if they were not doing this then the image would look somewhat like a blured 3-D image... not as bad but none the less slightly blurred.

Mark

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Mark J. Marshall
Film God

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


 - posted 11-04-2008 11:20 AM      Profile for Mark J. Marshall     Send New Private Message       Edit/Delete Post 
How exactly do you "throw out any data above 2K resolution"? Is there some resampling going on on the server or something?

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Dick Vaughan
Phenomenal Film Handler

Posts: 1032
From: Bradford, West Yorkshire, UK
Registered: Jul 2000


 - posted 11-05-2008 03:20 AM      Profile for Dick Vaughan   Author's Homepage   Email Dick Vaughan   Send New Private Message       Edit/Delete Post 
AFAIK when the Odeon Guildford ran Spidey 3 on both the Sony 4k and Christie CP2000 they ran the same 4k DCP

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Mark J. Marshall
Film God

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


 - posted 11-05-2008 07:20 AM      Profile for Mark J. Marshall     Send New Private Message       Edit/Delete Post 
I'm not doubting it's possible, I'm just wondering what it means.

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Chris Slycord
Film God

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


 - posted 11-05-2008 08:28 AM      Profile for Chris Slycord   Email Chris Slycord   Send New Private Message       Edit/Delete Post 
quote: Cameron Glendinning
Quick question
Are the ports and len's crystal clean? the reason I ask is that with film or digital basics like these can also be contrast killers.

I don't think he was saying that the contrast that they got out of the system was bad. I believe he was saying that IMAX's claim that multiple projectors increased contrast was untrue (the [bs] is "bs").

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Fred Tucker
Film Handler

Posts: 90
From: Sugar Land, TX
Registered: Sep 2007


 - posted 11-05-2008 10:35 AM      Profile for Fred Tucker   Email Fred Tucker   Send New Private Message       Edit/Delete Post 
Chris is right, the contrast is very good but equal to my other DLP house which does not carry the IMAX name.

In case anyone is wondering, the lenses are minolta & the port glasses are neumade. All cleaned on a daily basis with distilled water & lens tissue per IMAX.

Madagascar 2 came in for IMAX today, it is 2k content!

Mark, I see what your saying but IMAX says same image, exact same time and exact same place, pixel on top of pixel. I agree since there is no loss of image quality (atleast to the human eye) when one porojector's lens is covered. Granted it may have a slight loss that is not perceptible to myself or any of the other techs that were around when I performed this test but if thats the case then chances are no one is going to ever notice the differece.

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Edwin Schwing
Expert Film Handler

Posts: 116
From: Las Vegas NV
Registered: May 2002


 - posted 12-04-2008 01:35 AM      Profile for Edwin Schwing   Email Edwin Schwing   Send New Private Message       Edit/Delete Post 
IMAX is like K-Mart.

A name you know, a name you trust...

But when you see it, it's crap!

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Chris Slycord
Film God

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


 - posted 12-04-2008 07:21 AM      Profile for Chris Slycord   Email Chris Slycord   Send New Private Message       Edit/Delete Post 
There's a difference that K-Mart never had a good reputation to begin with.

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Edwin Schwing
Expert Film Handler

Posts: 116
From: Las Vegas NV
Registered: May 2002


 - posted 12-05-2008 09:13 AM      Profile for Edwin Schwing   Email Edwin Schwing   Send New Private Message       Edit/Delete Post 
Maybe not K-Mart, but how about S. S. Kresge.

http://en.wikipedia.org/wiki/Sebastian_S._Kresge

E

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Frank Angel
Film God

Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999


 - posted 12-15-2008 04:28 AM      Profile for Frank Angel   Author's Homepage   Email Frank Angel   Send New Private Message       Edit/Delete Post 
You all know I have never bought into the "digital must be good because it is digital" hype and have always been highly skeptical of all nonsense in those press releases about the digital conversion, but boys and girls, I just saw THE DAY THE EARTH STOOD STILL in IMAX digital, and I must say, if this is the way people will be watching films in the future, then I admit it, this changes my mind about digital.

Now mind you, this was not a "real" IMAX theatre with a full-sise IMAX screen. My guess is that it was about 50-55ft width with a slight curve and for this reason I was not evaluating it against what I know the original, full-size IMAX image looks like. But looking at this presentation against film presentation on the same size screen, i.e., against film in a similar size multiplex room, this digital show had one spectular image; there's no other way to describe it. Brightness, contrast, color saturation and apparant resolution looked better than multiplex film presentation, and not marginally better, but hands down better. Really, it put all my fears to rest that the conversion to digital would short-change or compromise presentation for future generations. If all digital presentation can mimic the quality of that IMAX show, then I have crossed to the other side of the isle.

The only anomily I saw in this presentation was that fast horizontal movements still have that slight strobe effect -- a kind of stuttery look that I find annoying, but that's just me --I can see the jump when they do drop frames to shorten the run time of films on TV and it drives me crazy, yet others don't know what I am talking about when I point it out, so evidently this isn't a big deal to most people. But other than that, everything else about the look of the image was striking. Yah, it may be 2K, but I can tell you, you'd be hard pressed in a blind test to tell if you were watching digital or 70mm. I know that up till now, I would consider that heresy coming from my mouth, but that was my honest feeling throughout the entire film. Bottom line, I was very impressed.

I don't know if it is the fact that they use 2 projectors that somehow makes the apparent resolution look so good -- it certainly accounted for the high brightness, but how they could get that crisp, crystal clear, razor sharp look using just 2K (my assumption, based on what you all have said about IMAX digital) is a mystery, but it WAS that good.

Even the fact that it was a silver screen wasn't as bad as I expected; truly I only noticed the hotspot when the entire screen went to white; when the picture was normal, it was barely detectible, even with me looking for it; I am sure most in the audience weren't distracted by it.

What WAS distracting was a light somewhere in the theatre that cast light on the very left corner of the screen. THAT was distracting, not fault of the digital system of course, but something the managment should have tended to. There were no cleaners to annoy me as I sat thru the credit crawl, so that made up for it.

I still feel that since our classic films will be waiting a long time to be transfered to digital prints, if they ever are, film will still be around for quite some time for the prep and art houses which for the most part can't afford digital conversion anyway, but this is going to be the way to go as film prints age and deteriorate more and more.

I am now convinced that the fear I once had that future generations would never be able to experience the richness of a LAWRENCE OF ARABIA on 70mm film the way we saw it in first run 70mm, is unfounded. If this is what it would look like in digital, at least IMAX's version of digital, then mission accomplished.

For the longest time I thought, if digital presentation was going to be what I saw in those early days of JURASSIC PARK and STAR WARS, then saying it was a viable replacement for film would have been akin to me going over to the Dark Side. But that is simply no longer the case as this IMAX presentation has been a revelation to me as to what digital is capable of looking like, and I assume it can only improve from here. Now it really is just a matter of the economics that will allow us to afford the technology.

PS -- Sound was spectacular as well, but that was expected.

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