These are now obsolete, and replaced by the system defined in the 2015 ITU BT.709-6.īT.709 offers over a variety of frame rates and scanning schemes, which along with separating the picture size from frame rate has provided the flexibility for BT.709 to become the worldwide standard for HDTV. Previous versions of BT.709 included legacy systems such as 1035ii25 HDTV systems. The image is 1920x1080 pixels, for a total pixel count of 2,073,600. Recommendation ITU-R BT.709-6 defines a common image format (CIF) where picture characteristics are independent of the frame rate. The standard is freely available at the ITU website, and that document should be used as the authoritative reference. So much so, some early HDTV systems such as 1125//50 were still a part of the standard as late as 2002 in BT.709-5. These early versions still left many unanswered questions, and the lack of consensus toward a worldwide HDTV standard was evident. The ITU superseded the CCIR in 1992, and subsequently released BT.709-1 in November 1993. XA/11 MOD F in 1989), with the stated goal of a worldwide HDTV standard. The first version of the standard was approved by the CCIR as Rec.709 in 1990 (there was also CCIR Rec. BT.709-6 defines the Picture characteristics as having a ( widescreen) aspect ratio of 16:9, 1080 active lines per picture, 1920 samples per line, and a square pixel aspect ratio. The most recent version is BT.709-6 released in 2015. 709, also known as Rec.709, BT.709, and ITU 709, is a standard developed by ITU-R for image encoding and signal characteristics of high-definition television. This includes Illuminant D65, the white point. All chromaticities of the BT.709 color gamut fall within the triangle that connects the primaries. BT.709 primaries shown on the CIE 1931 x, y chromaticity diagram.
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