i have searched all over the internet and cant find my answer. i want to know how much of a difference in quality is there between watching a blu-ray disc at 1080p and watching say an itunes movie i purchased at 1080p. no dvd's or hd dvd's involved. just the blu-ray disc at 1080p vs the digital file at 1080p. i have a 40'''''' tv. will i see a big difference or is there really any difference at all. again one is the blu-ray disc at 1080p and the other is a digital file at 1080p.


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they have the same quality, ergo, they'll look the same.
the only difference is that the digital archive can be burnt into a dvd and a blu-ray disc.


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the only difference is the storage medium. there won't be a difference. 1080p is 1080p


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blu-ray on disk is generally much better because digital copies are usually encoded to save space where the blu rays are the original, best copy


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1080p is 1080p. no difference.


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there is a difference and the blu ray will have more bits of information per second than a download will but the biggest difference is going to be in sound quality, no downloads as far as i know transmit a dolby true hd or master quality sound, if you have a larger tv say 47 and above you will see a difference in picture quality and if you have a high quality surround system you will definitely hear the difference in sound quality and surround, but if your tv is small and your using the tv speakers not much difference....


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a 1080p projectors have more detail over 720p but the visual quality isn't twice as good to justify double the price. it's much like speakers, once you get to one price point the extra audio quality you get for spending a lot more is much smaller. not to mention, a lot of people have cable or dishnetwork/directv programming which are far from being perfect since they're compressed more (it's much better to get local broadcasting over the air). so, unless you're going to be watching a lot of bluray movies or have one of those big satellite dishes then i say go with 720p.


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first off, apple tv does not output video at 1080p. from wikipedia (http://en.wikipedia.org/wiki/apple_tv#supported_formats):

''''''appletv's video output can be set to either 1080i or 1080p; however, this resolution is limited to the user interface and the viewing of photographs - all other content is simply upscaled to those resolutions. apple tv cannot play 1080i or 1080p video content (e.g., hd camera video) unless it is converted to a lower-resolution format.''''''

now even if apple tv supported that resolution, there is still the issue of the bitrate used for compression. hd video can be overcompressed resulting in a blocky appearance. so two 1080p video sources may still not look the same because of different bit-rates used for compression.

this article compared the bitrates of different hd sources: http://www.zdnet.com/blog/ou/heres-what-fake-hd-video-looks-like/962 . blu-ray is at the top with a rate of 40 mbps. over the air broadcasts (using an antenna) are at 20, digital cable is around 16, satellite is under 10, and apple tv is at 4.

you can look at screen captures for comparing different hd formats here: http://www.ilounge.com/index.php/articles/comments/apple-tv-20-vs-blu-ray-dvd-hd-cable-the-comparison/ .

on a 40'''''' tv you may not see much of a difference, it depends on how good the tv is.


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