Απάντηση: Re: Avatar
ποιο ειναι καλυτερο συστημα για να δεις το avatar το REAL 3D της VILLAGE ή αυτο της ODEON?
Μονο οι ψηφιακες προβολες μπορουν να ειναι 3d ή οποιαδηποτε αιθουσα κανει?
γιατι αποτι βλεπω στο
ODEON θεσσαλονικης δεν αναφερει οτι ειναι ψηφιακη προβολη μονο 3D...και επισης στο
VILLAGE (cosmos med) το δειχνει στην αιθουσα VMAX που δεν ειναι για ψηφιακες προβολες, εκτος της αιθουσας 5 που ειναι Digital – Real D (αιθ.5)...?
τι γινεται τελικα?
Συμφωνα με αυτα που διαβαζω, μαλλον καλυτερα αποτελεσματα εχει το Doldy 3D που εχει στα Odeon.
Για οποιον εχει ορεξη, ακολουθει αναλυση των διαφορων τους:
I see a lot of bad info about this, so I just wanted to post some fact and a little opinion. I will just give some technical details about the two systems. I have been involved with setups of both Real D and Dolby 3D so I don't want to get into a better/worse discussion.
Both systems use the identical projectors. As far as I know, all of the current installs are using NEC, Barco, or Christie projectors. All are 2K D-Cinema DLP projectors, and most are 6K lamp setups to get as much light as possible. I have been in at least two trying to get by on a 4.5K but it is not enough on the older projectors. There are some newer installs using the smaller DLP chip (1.7 inch vs 2.1 inch) that even though limited to a 4.5K lamp can put out as much 3D light as the older 6K's thanks to being able to use the entire chip in 3D mode which the larger chip projectors can't due to speed limitations.
Both Real D and Dolby 3D alternate eyes at 3 times frame rate. The projector settings are basically identical in this regaurd. So in 1/24 of a second, you see left eye 3 times and right eye 3 times. This means the projector is actually showing 144 frames per second. Think of it as having a 3 blade shutter for each eye in film projectors. The newer small chips can do this frame rate for all 2 million pixels, the older projectors cannot. In effect, we get about 2/3 of the light in 3D mode because of this issue. TI is working to improve this though.
In Real D the image is projected through an active LCD "Z-Screen" that alternates between right hand and left hand circular polarization at the 144 hz rate following a sync signal from the projector. The Dolby system has the filter wheel mounted between the lamp and the integrater rod. The wheel has 1/2 filtering for left eye, and the other half filtering for right eye. It uses the same sync signal from the projector to drive it at the same 144 hz or 4320 rpm. The filters are a multi layer interference filter that splits all three primaries into narrower bands of red, green, and blue.
The glasses have matching filters to separate the two images. The Real D glasses use the matching circular polarizers to split the two images. Since the Dolby system is using different colors, the screen can be white, where the Real D has to hold polarization which requires the silvered screen. The two systems are actually very close in light output. The filters in Dolby split the light in half, plus a little total loss, and the Z-screen also does about the same in that regaurd. Then you are also only showing each eye for a little less than 1/2 the time, as well as watching it through glasses. The high gain of the silver screen does give a peak brightness gain for Real D but at the cost of a little less light on the edges. There are actually some Dolby 3D sites that went with a lower gain silver screen to make enough light due to using a larger screen than recomend.
Real D color corrects for the glasses and Z-Screen by shooting the colors through the glasses with a separate preset in the projector for 3D. The Dolby system is a bit more complex as the color shift of the two eyes is different so the colors are corrected in the server by shooting the colors through the glasses again, but for each eye separately.
I have seen both systems, but I will not state preference. I will state that the color wheel does not make for any artifact that is different than the alternating of eyes of any sequential frame 3D system. Even shutter glasses at the same 144 hz frame rate will have this same artifact. And most shutter glasses operate at only double frame rate, or 96 hz which gives a more noticeable jutter on pans. Unlike a single chip DLP projector with a color wheel, the projector is always giving all 3 primaries to one eye in all systems. The three only truely differ in how they are separated at the viewer.
Real D and Dolby use passive glasses. Dolby and shutter glasses can use a white screen. Shutter glasses need batteries and electronics in them. There are differences in ghosting and such, but I will let others talk about that.
http://www.avsforum.com/avs-vb/showthread.php?p=15388203#post15388203
