Rec. 709
E931392
Rec. 709 is the ITU-R standard that defines the color space, transfer characteristics, and other parameters for HDTV video, widely used as the baseline for high-definition television and video production.
All labels observed (10)
| Label | Occurrences |
|---|---|
| BT.709 | 3 |
| Recommendation ITU-R BT.709 | 3 |
| Rec. 709 canonical | 2 |
| Rec.709 | 2 |
| BT.709 for UHDTV applications | 1 |
| ITU-R BT.709 | 1 |
| ITU-R Recommendation BT.709 | 1 |
| Rec. 601 for HD applications | 1 |
| Rec. 709 color space | 1 |
| Rec. BT.709 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11536888 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Rec. 709 Context triple: [Rec. 2020, successorOf, Rec. 709]
-
A.
SMPTE ST 2094
SMPTE ST 2094 is a family of standards that define dynamic metadata for high dynamic range (HDR) video to optimize content display on different screens.
-
B.
SMPTE ST 2084
SMPTE ST 2084 is a high-dynamic-range (HDR) electro‑optical transfer function standard, also known as Perceptual Quantizer (PQ), widely used in modern HDR video systems such as HDR10 and Dolby Vision.
-
C.
SMPTE 421M
SMPTE 421M is the formal SMPTE standard that defines the VC-1 video compression format used for high-definition video encoding and distribution.
-
D.
SMPTE ST 2086 mastering display metadata standard
SMPTE ST 2086 is a standard that defines static mastering display color volume metadata for HDR content, specifying the color primaries, white point, and luminance characteristics of the reference display used during mastering.
-
E.
SMPTE ST 2059
SMPTE ST 2059 is a professional media industry standard that defines how to use IEEE 1588 Precision Time Protocol to synchronize clocks and signals across IP-based audio, video, and broadcast systems.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Rec. 709 Target entity description: Rec. 709 is the ITU-R standard that defines the color space, transfer characteristics, and other parameters for HDTV video, widely used as the baseline for high-definition television and video production.
-
A.
SMPTE ST 2094
SMPTE ST 2094 is a family of standards that define dynamic metadata for high dynamic range (HDR) video to optimize content display on different screens.
-
B.
SMPTE ST 2084
SMPTE ST 2084 is a high-dynamic-range (HDR) electro‑optical transfer function standard, also known as Perceptual Quantizer (PQ), widely used in modern HDR video systems such as HDR10 and Dolby Vision.
-
C.
SMPTE 421M
SMPTE 421M is the formal SMPTE standard that defines the VC-1 video compression format used for high-definition video encoding and distribution.
-
D.
SMPTE ST 2086 mastering display metadata standard
SMPTE ST 2086 is a standard that defines static mastering display color volume metadata for HDR content, specifying the color primaries, white point, and luminance characteristics of the reference display used during mastering.
-
E.
SMPTE ST 2059
SMPTE ST 2059 is a professional media industry standard that defines how to use IEEE 1588 Precision Time Protocol to synchronize clocks and signals across IP-based audio, video, and broadcast systems.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
ITU-R Recommendation
ⓘ
color space specification ⓘ video standard ⓘ |
| abbreviationOf |
Recommendation ITU-R BT.709
ⓘ
linked to:
Rec. 709
|
| alsoKnownAs |
BT.709
ⓘ
linked to:
Rec. 709
ITU-R BT.709 ⓘ
linked to:
Rec. 709
|
| appliesTo |
HD video production
ⓘ
HDTV studio signals ⓘ high-definition television ⓘ |
| bitDepthSupported | 10-bit per component ⓘ |
| bitDepthTypical | 8-bit per component ⓘ |
| chromaSubsamplingTypical |
4:2:0
ⓘ
4:2:2 ⓘ |
| colorEncodingFormats |
RGB
ⓘ
YCbCr ⓘ |
| colorPrimariesBlue |
x=0.150
ⓘ
y=0.060 ⓘ |
| colorPrimariesGreen |
x=0.300
ⓘ
y=0.600 ⓘ |
| colorPrimariesRed |
x=0.640
ⓘ
y=0.330 ⓘ |
| defines |
HDTV color space
ⓘ
HDTV system parameters ⓘ HDTV transfer characteristics ⓘ reference viewing conditions for HDTV ⓘ |
| differsFromSRGBIn | transfer function ⓘ |
| fullName |
ITU-R Recommendation BT.709
ⓘ
linked to:
Rec. 709
|
| governs | color reproduction for HD broadcast chains ⓘ |
| matrixCoefficients | BT.709 luma-chroma encoding ⓘ |
| nominalGamma | approximately 2.4 ⓘ |
| nominalLumaCoefficientCb | -0.1146 ⓘ |
| nominalLumaCoefficientCr | -0.3854 ⓘ |
| nominalLumaCoefficientY | 0.2126 ⓘ |
| primaryUseRegion | worldwide ⓘ |
| publishedBy |
International Telecommunication Union Radiocommunication Sector
ⓘ
linked to:
ITU Radiocommunication Sector
|
| relatedStandard |
Rec. 2020
ⓘ
Rec. 601 ⓘ sRGB ⓘ |
| relationshipToSRGB | shares same chromaticities and white point as sRGB ⓘ |
| scope | studio and production HDTV signals ⓘ |
| status | widely adopted ⓘ |
| supersedes |
Rec. 601 for HD applications
ⓘ
linked to:
Rec. 709
|
| transferCharacteristic |
OETF with linear segment near black
ⓘ
gamma-like opto-electronic transfer function ⓘ |
| usedAs |
baseline color space for HDTV
ⓘ
mastering color space for many TV programs ⓘ reference color space for broadcast HD ⓘ |
| whitePoint |
CIE Standard Illuminant D65
ⓘ
linked to:
CIE standard illuminant D65
|
| whitePointX | 0.3127 ⓘ |
| whitePointY | 0.3290 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Rec. 709 Description of subject: Rec. 709 is the ITU-R standard that defines the color space, transfer characteristics, and other parameters for HDTV video, widely used as the baseline for high-definition television and video production.
Referenced by (16)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Rec. 709
linked to: Rec. 709
linked to: Rec. 709
linked to: Rec. 709
linked to: Rec. 709
linked to: Rec. 709
linked to: Rec. 709
linked to: Rec. 709
linked to: Rec. 709
linked to: Rec. 709
linked to: Rec. 709
linked to: Rec. 709