3d glasses question

donnajunkie

hi,
i saw avatar 3d recently. as the glasses seem to be better than those card board things with the coloured lenses i hoped they would perform better with 3d blu ray films. they dont work at all with them though. how come?

elvch01

A 3D film is actually projected two-fold (one for each eye) and the 3D glasses split the hybrid image back into left & right eyes. The "old" way to do this was using colour filtered glasses, but nowadays, each of the two images is projected through a polarising filer, and the filers as set at 90degrees to each other. The glasses are also polarising filters which will only let through the appropriately polarised image.

In either case, there is no way that a "normal" image e.g. on a TV etc can be split to form a 3D images - simply because there is only a single image source.

aliEnRIK

donnajunkie wrote: »

hi,
i saw avatar 3d recently. as the glasses seem to be better than those card board things with the coloured lenses i hoped they would perform better with 3d blu ray films. they dont work at all with them though. how come?

So you stole the glasses?

donnajunkie

elvch01 wrote: »

A 3D film is actually projected two-fold (one for each eye) and the 3D glasses split the hybrid image back into left & right eyes. The "old" way to do this was using colour filtered glasses, but nowadays, each of the two images is projected through a polarising filer, and the filers as set at 90degrees to each other. The glasses are also polarising filters which will only let through the appropriately polarised image.

In either case, there is no way that a "normal" image e.g. on a TV etc can be split to form a 3D images - simply because there is only a single image source.

thanks for your explaination although i'm still a little confused.
i guess i thought they would work for watching my blu rays that are in 3d because i have often seen talk of people using better glasses than the glasses that are included with the blu rays.

triggerhappy_2

aliEnRIK wrote: »

So you stole the glasses?

I had to buy them when I went to see Avatar. More clutter for my house

donnajunkie

aliEnRIK wrote: »

So you stole the glasses?

i dont think they reuse them for health and hygiene reasons. we were handed ours as we went in and they were sealed in plastic and obviously new. we were never given any reason to believe we had to give them back so we didnt.

elvch01

donnajunkie wrote: »

thanks for your explaination although i'm still a little confused.
i guess i thought they would work for watching my blu rays that are in 3d because i have often seen talk of people using better glasses than the glasses that are included with the blu rays.

You might be right, but these will be a variant of the red/blue (or whatever colours they choose) By combining two images with different colour filters, a normal TV can show 3D films. Unfortunately the technique of projecting separate (left & right eye) images used in Avatar is not color based, but uses polarising filters.

If 3D film makers all chose the came red/blue colour combination for their filters, then I can see that there might be a market for improved quality 3D specs. But I'm not sure whetehr there is such agreement, therefore each 3D film might need its own glasses

Esqui

I much prefer the polarising filters, as red/blue or red/green glasses don't work quite so well for me as I'm slightly colourblind (just ends up with the effect of two flat images).

Also, I think after they collect the used glasses, they clean and sterilise them before repackaging them.

4743hudsonj

Esqui wrote: »

I much prefer the polarising filters, as red/blue or red/green glasses don't work quite so well for me as I'm slightly colourblind (just ends up with the effect of two flat images).

Also, I think after they collect the used glasses, they clean and sterilise them before repackaging them.

I cant use the blue and red/yellow style glasses as i have trouble forgetting the fact im watching a movie in blue and red. even in a dark room with my lcd backlight on full and brightness full (making the image washed out) i still either see the movie in red or blue depending on what catches my eye more.

Thankgod they still release 2d versions alongside the 3d ones.

donnajunkie

4743hudsonj wrote: »

I cant use the blue and red/yellow style glasses as i have trouble forgetting the fact im watching a movie in blue and red. even in a dark room with my lcd backlight on full and brightness full (making the image washed out) i still either see the movie in red or blue depending on what catches my eye more.

Thankgod they still release 2d versions alongside the 3d ones.

yeah, while the 3d effects can be good the colours dont look right. that is why i was hoping the glasses from the cinema would work and remove that problem. i've only got 2 3d blu rays and i mainly got them coz i fancied seeing films in 3d. i had not seen the films before. both are very average. journey to the centre of the earth has great 3d effects and is made worth watching by them. my bloody valentine has poor 3d effects and with it not being that good a film it is only just about watchable.