zombie84 said:
SilverWook said:
Harmy said:
Well, the thing is, I'm sure you can always watch a 3D film in 2D.
Are 3D Blu Rays "backwards compatible" with 2D viewing?
My understanding was that they are not. But you can buy...2D glasses? I'm not sure what to call them, but you wear them and it makes it look like 2D. They made them for people who get headaches from the 3D. But if 3D becomes an industry norm then I'm sure there will be TVs or players made where it converts the image back into 2D.
Harmy said:
Stereo 3D consists of 2 2D images, so you should always be able to just view only the left or the right eye picture, there's no "conversion" involved.
Speaking as the owner of 3D blu-rays, the official answer is:
It depends.
It's stored on the disc as two separate streams. The left eye is in the "regular" place that right eye is in a "special folder". If you don't have a 3DBD player, it knows not to look for the other content and therefore just ignores it. It plays the left eye as the 2D version.
~HOWEVER~
(and this is a big one)
The menu software on a 3DBD may detect if the player is 3D compatible. If it's not, the menu may prevent playback of the disc at all. I think ALL Disney 3DBDs are like this. A quick rule of thumb is: If it comes in a multi-pack with a 2D only BD, it's likely that the 3DBD won't play in a normal 2D player.
Some 3DBD players have the option to just display left or right eye, and a lot of 3DTVs have the option as well. However Disney would really like you to watch the 2D disc if you're watching it in 2D since they do some fancy stuff in 3D besides presenting you with another eye.
For example, the 2D version of Tangled is "shot" with a narrow focus. The green hills in the distance are a soft green blur. The 3D version is "shot" with deep focus and individual trees are seen on distant hills. The extra detail on the trees allows the eyes/brain to gauge the simulated distance of the trees much better than an out-of-focus green smear.
Also, Disney is a fan of "floating windows" for 3D, which means that the black matte surrounding the picture is often changing shape and size. For any 3D shot, there is a plane perpendicular to the viewing angle which represents the screen. Depending on the shot, this plane may or may not be the same distance from the viewer as the actial screen. Since the black matte is a negative object, it should always be at screen depth, not floating in front of or behind the screen. So the 2D depiction of the black matte moves to match.
The left eye stream has been optimized to be part of a 3D presentation and isn't the same as the 2D stream. So, to maximize quality for both 2D and 3D, Disney (and some others) provide separate versions which don't compromise for the sake of the other viewing method.
Also, the potential bitrate per eye is higher in 2D, since it's only providing half as many pixels.
Finally, the extra space 3D video takes on the BD comes at the cost of space for special features. Some features can be moved to a "feature" disc, but others (like commentary or enhanced viewing modes) can't, so the 2D version is also required if those kind of features are to be included.