Based on information obtained on the website:
http://myhometheater.homestead.com/v...alculator.html
I have made a graph with the distances and sizes of screens recommended by the standards SMPTE and THX.
The proportion of the following screen measures is 16:9. With 1080p content and the measures are the diagonal of the screen.
Differences between the standards:
SMPTE
http://www.smpte.org/
Maximum size recommended by standard SMPTE:
THX
http://www.thx.com/
Minimum size of screen recommended by THX:
Screen size recommended by THX:
Viewing Distance when Resolution becomes important:
Screen Size x Viewing Distance
480p
720p
1080p
1440p
Source: http://www.carltonbale.com/2006/11/1080p-does-matter/
Peter
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Gary Contribution:
http://myhometheater.homestead.com/v...alculator.html
I have made a graph with the distances and sizes of screens recommended by the standards SMPTE and THX.
The proportion of the following screen measures is 16:9. With 1080p content and the measures are the diagonal of the screen.
Differences between the standards:
SMPTE
http://www.smpte.org/
Maximum size recommended by standard SMPTE:
THX
http://www.thx.com/
Minimum size of screen recommended by THX:
Screen size recommended by THX:
Viewing Distance when Resolution becomes important:
Screen Size x Viewing Distance
480p
720p
1080p
1440p
Source: http://www.carltonbale.com/2006/11/1080p-does-matter/
Peter
--------------------------------------------------------------------------------------------
Gary Contribution:
Quote:
Originally Posted by Gary Lightfoot 
This often comes up here and other places, and this diagram is gives a good idea of what viewing angles seating distances will give:
Using image height and width is preferable to diagonal measurements since they're a lot easier to work with, and removes confusion with screen aspect ratio - many people here have 2.35 screens.
THXs recommended viewing angle for HD 16:9 screens is 40 degrees, or 2.4 image heights. That also works for people with 2.35 screens who use an anamorphic lens, and may work with some pjs that zoom for scope.
The film industry often recommends 3 x IH for seating distance based on the crossover point between immersion (closer is considered better) and where image artefacts like film grain and projector induced issues become visible. With digital and good HD content that limitation is reduced, and is probably why THX recommend 2.4 x IH rather than 3. Sitting anywhere between 2 to 4 times the Image Height puts you within the usual range of a commercial theatre, and with 1080 displays, we're pretty much there with regards to resolution and image quality.
As Darin has pointed out, THX often gets misquoted but this video may be of interest:
http://www.youtube.com/watch?v=rBdmG...embedded#at=50
I also think it[s worth pointing out that the graphs that say where certain resolutions become noticeable doesn't mean you should sit there. In fact you should probably sit closer because those distances are where the Human eye can start to resolve those resolutions, but when comparing something like a 720 pj to a 1080 pj you might not be able to tell the difference until you get much closer.
Gary
This often comes up here and other places, and this diagram is gives a good idea of what viewing angles seating distances will give:
Using image height and width is preferable to diagonal measurements since they're a lot easier to work with, and removes confusion with screen aspect ratio - many people here have 2.35 screens.
THXs recommended viewing angle for HD 16:9 screens is 40 degrees, or 2.4 image heights. That also works for people with 2.35 screens who use an anamorphic lens, and may work with some pjs that zoom for scope.
The film industry often recommends 3 x IH for seating distance based on the crossover point between immersion (closer is considered better) and where image artefacts like film grain and projector induced issues become visible. With digital and good HD content that limitation is reduced, and is probably why THX recommend 2.4 x IH rather than 3. Sitting anywhere between 2 to 4 times the Image Height puts you within the usual range of a commercial theatre, and with 1080 displays, we're pretty much there with regards to resolution and image quality.
As Darin has pointed out, THX often gets misquoted but this video may be of interest:
http://www.youtube.com/watch?v=rBdmG...embedded#at=50
I also think it[s worth pointing out that the graphs that say where certain resolutions become noticeable doesn't mean you should sit there. In fact you should probably sit closer because those distances are where the Human eye can start to resolve those resolutions, but when comparing something like a 720 pj to a 1080 pj you might not be able to tell the difference until you get much closer.
Gary
