Board Thread:S,R,&G/@comment-26391060-20140706230026

While it is noted that BD would be release with 1920x1080p resolution, when it air via channel, it is possible for the channel to air it with 1280x720, or 1440x1080p, or 1920x1080i format, depend on choices made by the one who release it and how amny bandwidth can the channel use. a 1920x1080i format represent that it refresh the screen in an interlancing manner, which only 2 consecutive frame refresh could produce a complete frame. a 1440x1080 release take benefit of the fact that because human eye is more sensitive to vertical resolution when comparing it to horizontal resolution, they reduce the horizontal resolution by 1/3 and made each pixel become rectangular such that it could pack into channel width while retaining vertical resolution unchange. Both of these two methods would generate a screenshot of 1920x1080 size when you take it.

and as a note, from what I read, anime production company rarely produce anime in 1080p format, probably just one or two show in every season would be produced in 1080p format, and for others, no matter what format they are release in, like if it is BD release or HDTV release or whatever, they just upscale those content before air/release/sold them. 