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This topic comprises 11 pages: 1 2 3 ... 8 9 10 11
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Topic: Real D & Dolby 3-D - What is the difference?
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Julio Roberto
Jedi Master Film Handler
Posts: 938
From: Madrid, Madrid, Spain
Registered: Oct 2008
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posted 04-17-2009 11:57 AM
All 3D systems, when properly installed and calibrated, should produce about the same image quality. There are only minor differences:
-Dolby's colors are a bit different due to the filters and reduced color gamut
-RealD has more potential ghosting (double images in scenes with very bright stuff on darkish backgrounds, i.e.). It's followed by Master Image, then XpanD and finally Dolby.
-Both realD and Master Image need to use the "usually not very good" silver screen, which may affect images in more than one way, unless it's a good one, well installed and the projection calibrated for it.
-XpanD would "flicker" a bit more than the other systems. Also, the projection needs to be color corrected through the glasses just like with any other system, as the glasses do alter the color a bit. RealD's and Master Images's as well, but a bit less.
But all 3D products MUST produce the exact same result aside from differences in:
-minor colormetry issues (that can be mostly corrected) coming from the filters used in the glasses or the projectors
-light uniformity issues from silver screens (that can also be minimized, but often are not)
-light intensity issues (that can theoretically always be properly corrected by using even more powerful lamps/multiple projectors)
-ghosting (which can be reduced by lowering the contrast-and-thus-quality of the film through ghostbusting processes done at the studio or by the server)
Otherwise, they are "identical" in the result and thus shouldn't significantly produce a different experience.
Another difference is with dual projection systems (Imax) or dual-lens systems (sony). They have the added advantage that they don't "flicker" (they don't produce assymetrical temporal disparities) at all, like all the other systems do. Also, in practical terms, they MAY (but not necessarily) offer better-everything (better lighting, less ghosting, better color resolution and depth, etc). They also MAY produce worse distortions (keystoning) and light uniformity (i.e. one projector is brighter than the other or brighter in different parts of the screen, as when the bulb is not perfectly aligned in both the same).
Nevertheless, the screen size, seating position, and sourrindings do affect the 3D perception, so one can only properly compare 3D systems when watched in very similar screens at similar distances/positions.
The amount of ambient light as well as "obstacles" (i.e. people's heads in front of you, etc) also contribute to the perception of depth, as our brain's visual system compares stuff relative to other stuff. Thus color "white" is only color "white" when we compare it with other known colors and automatically adjust to it. And "far or near" perception is similarly helped by other clues such as perspective, etc
i.e. you can fool the eye into thinking stuff is close or far with forced-perspective miniatures, etc, like in this music video, where we are made believed that stuff is further (and bigger) than they are.
http://www.youtube.com/watch?v=bZYh_HRY70g
If we had a reference point, like say the head of an espectator in front of us that we know it's aprox. 1 meter away, then we could more properly judge where the rest of the stuff is suppossed to be in space in a 3D movie. If the theater is all dark and there's "nothing but darkness" between us and the screen, it would be hard to judge just exactly how far or close those objects in the movie are suppossed to be. Depending on your seating position, you could get quite a different (subjective) experience.
[ 04-17-2009, 03:20 PM: Message edited by: Julio Roberto ]
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