HD Ready 1080p

1080/24p

High Definition (True Film) format to be used by HD DVD and Blu-ray when the source material comes from film. When all 1080 lines of picture information are displayed as a complete frame 24 times per second it emulates the 24 frame rate used by film cameras to shoot movies. Currently, Blu-ray discs authored this way are converted by the player to display at 60Hz to make them compatible with TVs, but soon TV displays will be able to accept a true 24 frame input. This eliminates the conversion process and allows the movie to be played back at the same rate as it was originally shot.

1080i/50

One of the broadcast formats that will be used for High Definition broadcasts in the UK. This means that the picture comprises of 1080 active lines from the top of the screen to the bottom and is displayed at 50 fields per second. The whole image (frame) is never displayed at one time because the lines are interlaced (i) - odd lines are displayed in one scan and even lines in another. 25 complete frames are shown per second. In full, 1125 lines by 1920 pixels make up the whole broadcast but only 1080 lines are used for the picture information.

1080p/25

High Definition format to be used for HD gaming or HD DVD and Blu-ray when the source material comes from video. When all 1080 lines of picture information are displayed as a complete frame 25 times per second, this is known as a progressive display, hence 'p'. To be compatible with current TV displays each complete frame is displayed twice to give a 50 or 60 Hz flicker free image. The alternative method of display is known as interlaced (1080i) and is used for HDTV broadcasts.