Rec. 709 | rec 709
ITU-RRecommendationBT.709,alsoknownbytheabbreviationsRec. 709,BT.709,andITU709,standardizestheformatofhigh-definitiontelevision,having16:9(widescreen)aspectratio.Thefirsteditionofthestandardwasapprovedin1990.Technicaldetails[edit]Pixelcount[edit]Rec. 709referstoHDTVsystemshavingroughlytwomillionlumasamplesperframe.Rec. 709hastwoparts:Part 2codifiescurrentandprospective1080iand1080psystemswithsquaresampling.Inanattempttounify1080-lineHDTVstandards,part 2definesacommonimageformat(CIF)withpictu...
ITU-R Recommendation BT.709, also known by the abbreviations Rec. 709, BT.709, and ITU709, standardizes the format of high-definition television, having 16:9 (widescreen) aspect ratio. The first edition of the standard was approved in 1990.
Technical details[edit] Pixel count[edit]Rec. 709 refers to HDTV systems having roughly two million luma samples per frame. Rec. 709 has two parts:
Part 2 codifies current and prospective 1080i and 1080p systems with square sampling. In an attempt to unify 1080-line HDTV standards, part 2 defines a common image format (CIF) with picture parameters independent of the picture rate.
Part 1 codifies what are now referred to as 1035i30 and 1152i25 HDTV systems. The 1035i30 system is now obsolete, having been superseded by 1080i and 1080p square-sampled ("square-pixel") systems. The 1152i25 system was used for experimental equipment in Europe and was never commercially deployed.[citation needed]
Frame rate[edit]Rec...