Can Dolby 3D notch-filter glasses work with prints or OLED displays?
Asked 12/7/2024
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Dolby 3D uses different narrow red, green, and blue wavelength bands for each eye, with matching filters in the projection system and the glasses. Could a stereo left/right image pair ever be encoded into a photographic print, or into an emissive display such as OLED, so the glasses would separate the two views and produce a 3D image? My assumption is that this is impractical because Dolby 3D depends on very precise narrow spectral bands that ordinary printing and display technologies may not be able to reproduce.
Originally by user130030. Source · Licensed CC BY-SA 4.0
user130030
1y ago
2 Answers
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...into a photo print?
I'm guessing that it could not ever be made to work in practice. Dolby-3D relies on using six, narrow-band wavelengths of light. Traditional color printing relies on inks that absorb broad bands of color. For example, in order for the yellow ink to be able to produce a saturated yellow color, it must absorb all of the wavelengths that look blue to your eyes. If it only absorbed a single, narrow band of blue, then the effect would only be a very pale yellow color on the page.
If there was some combination of inks (maybe a lot of different inks) that could cause the print to only reflect in those six narrow wavelength bands, then that would mean that the paper was absorbing most of the ambient light that fell on it. That is to say, the image would look very dark.
...into a video file?
They already do encode it into video files. That's how movies are distributed to theaters anymore. I don't know of any theater in my city that hasn't gone digital. IDK if movie distributors even make film prints these days.
BUT...
It only makes sense to show those video files using video projectors or video monitors that emit those same six narrow wavelength bands. Any projector or monitor that anybody* has in their home right now (as far as I know) only emits three bands of red, green, and blue.
* Not counting any multi-billionaires who may have commercial movie house equivalent screening rooms in their homes or, on board their yachts.
Originally by Solomon Slow. Source · Licensed CC BY-SA 4.0
Solomon Slow
1y ago
0
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For a photographic print, effectively no in normal practice.
Dolby 3D works by sending six narrow wavelength bands of light—three for each eye. Standard color printing does not reflect such precise bands. Printing inks absorb broad ranges of wavelengths, not narrow notches, so they cannot cleanly encode separate left/right spectral channels the way a Dolby 3D projector can.
In theory, a print could only work if it used some very specialized set of pigments or inks that reflected just those narrow wavelength bands. But that would mean absorbing most of the incoming light, so the print would appear extremely dark and impractical.
So the core issue is spectral precision: Dolby 3D depends on tightly controlled light output, while ordinary reflective media do not provide that control.
The same general limitation applies to typical displays unless they are specifically engineered to emit the required narrow bands. In short, Dolby 3D glasses are designed to work with a matched projection system, not ordinary prints or standard displays.
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