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SilkPyjamas (talk | contribs) m Adding short description: "Relationship between electrical signal and light" |
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{{Short description|Relationship between electrical signal and light}}
[[Image]]s and [[video]]s use specific [[transfer function]]s to describe the relationship between [[Signal|electrical signal]], scene light and displayed light.
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The '''opto-electronic transfer function''' ('''OETF''') is the [[transfer function]] having the scene light as input and converting into the picture or video signal as output. This is typically done within a [[camera]].<ref name=":0">{{Cite web|title=BT.2100 : Image parameter values for high dynamic range television for use in production and international programme exchange|url=https://www.itu.int/rec/R-REC-BT.2100-2-201807-I/en|access-date=2021-02-02|website=www.itu.int}}</ref>
The '''electro-optical transfer function''' ('''EOTF''') is the [[transfer function]] having the picture or video signal as input and converting it into the linear light output of the display.<ref name=":0" /> This is done within
The '''opto-optical transfer function''' ('''OOTF''') is the [[transfer function]] having the scene light as input and the displayed light as output. The OOTF is the
== List of transfer functions ==
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* [[Rec. 601]], [[Rec. 709]] and [[Rec. 2020]]: The [[ITU-R]] '''recommendations BT.601, BT.709 and BT.2020''' describe the reference OETF of respectively [[Standard-definition television|SD-TV]],<ref name=":3" /> [[High-definition television|HD-TV]]<ref name=":1" /> and [[Ultra-high-definition television|UHD-TV]].<ref name=":4" /> They are identical OETF based on a [[gamma curve]] and used for [[Standard-dynamic-range video|SDR-TV]].<ref name=":3">{{Cite web|title=BT.601 : Studio encoding parameters of digital television for standard 4:3 and wide screen 16:9 aspect ratios|url=https://www.itu.int/rec/R-REC-BT.601/en|access-date=2021-02-02|website=www.itu.int}}</ref><ref name=":1">{{Cite web|title=BT.709 : Parameter values for the HDTV standards for production and international programme exchange|url=https://www.itu.int/rec/R-REC-BT.709/en|access-date=2021-02-02|website=www.itu.int}}</ref><ref name=":4">{{Cite web|title=BT.2020 : Parameter values for ultra-high definition television systems for production and international programme exchange|url=https://www.itu.int/rec/R-REC-BT.2020/en|access-date=2021-02-02|website=www.itu.int}}</ref>
* [[BT.1886]]: The '''ITU-R Recommendation BT.1886''' is the reference EOTF of [[Standard-dynamic-range video|Standard Dynamic Range TV (SDR)]].<ref name=":2">{{Cite web|title=BT.1886 : Reference electro-optical transfer function for flat panel displays used in HDTV studio production|url=https://www.itu.int/rec/R-REC-BT.1886/en|access-date=2021-02-02|website=www.itu.int}}</ref>
* [[sRGB]]''': sRGB''' defines a transfer function based on a gamma curve and used for monitors, printers
=== [[
* '''[[S-Log]]''': Developed by [[Sony]] for [[digital camera]]s in order to increase captured [[dynamic range]]<ref>{{Cite web|title={{!}} Help Guide for Creators {{!}} What is S-Log?|url=https://helpguide.sony.net/di/pp/v1/en/contents/TP0000909108.html|access-date=2021-02-02|website=helpguide.sony.net}}</ref>
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