Archive:Ultra Widescreen (21:9 aspect ratio) skins for Kodi: Difference between revisions

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==Overview==
==Overview==
The 64:27 aspect ratio is the logical extension of the existing video aspect ratios 4:3 and 16:9, as it is the third power of 4:3, where 16:9 of traditional HDTV is 4:3 squared. This allows electronic scalers to use an easily implementable 4:3 (1.33:1) scaling factor.  
The 64:27 aspect ratio is the logical extension of the existing video aspect ratios 4:3 and 16:9, as it is the third power of 4:3, where 16:9 of traditional HDTV is 4:3 squared. This allows electronic scalers to use an easily implementable 4:3 (1.33:1) scaling factor. 21:9 (2.33:1) is the approximated screen aspect ratio of the true value 64:27 (2.370:1) in comparison to the common ratio of 16:9 (1.77:1).


21:9 (2.33:1) is the approximated screen aspect ratio of the true value 64:27 (2.370:1) in comparison to the common ratio of 16:9 (1.77:1).
====Film formats and 21:9====
{| class="wikitable"
|-
! Format !! Aspect ratio
|-
| Cinemascope by Panavision (1950s–1970s) || 2.35:1
|-
| "21:9" (64:27) / "Ultra Widescreen" televisions || 2.37:1
|-
| Anamorphic, modern cinema widescreen format || 2.39:1
|}


The term "21:9" was chosen as a marketing term, probably first used by Philips. Due to its common denominator, 21:9 is more relatable to 16:9, the aspect ratio of regular HDTVs, rather than the correct 64:27 or 21\tfrac{1}{3}:9. If it actually were 21:9, the fraction could be expressed more elegantly in the reduced form as 7:3.
The term "21:9" was chosen as a marketing term, probably first used by Philips. Due to its common denominator, 21:9 sounds more similar to 16:9, the aspect ratio of regular HDTVs, rather than the correct 64:27 or 21\tfrac{1}{3}:9. If it actually were 21:9, the fraction could be expressed more elegantly in the reduced form as 7:3.


==== Examples ====
==== Examples ====
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[[File:CIH - The Witcher 3 Gameplay Video in 16.9.jpg|570px]]
[[File:CIH - The Witcher 3 Gameplay Video in 16.9.jpg|570px]]


==Film formats and 21:9==
==Resolution and Aspect Ratio==
 
==Film formats and 21:9==
{| class="wikitable"
|-
! Format !! Aspect ratio
|-
| Cinemascope by Panavision (1950s–1970s) || 2.35:1
|-
| "21:9" (64:27) / "Ultra Widescreen" televisions || 2.37:1
|-
| Anamorphic, modern cinema widescreen format || 2.39:1
|}


=== HDMI output standardization===
=== HDMI output standardization===
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An additional resolution of 5120×2160p ("5K") could be added at a later time to provide a non-anamorphic UltraHD signal in 21:9. Variations of the 8K UltraHD resultions could also be considered, at 7680×4320p anamorphic and 10240x4320p non-anamorphic.
An additional resolution of 5120×2160p ("5K") could be added at a later time to provide a non-anamorphic UltraHD signal in 21:9. Variations of the 8K UltraHD resultions could also be considered, at 7680×4320p anamorphic and 10240x4320p non-anamorphic.
===Resolution and Aspect Ratio Explained===
Video by the ProjectorPeople.com which does a good job at explaining resolution and aspect ratio:
{{youtube|npbsI8-nD-4}}


==Kodi skins supporting 21:9 aspect ratio==
==Kodi skins supporting 21:9 aspect ratio==

Revision as of 08:37, 4 June 2015

Home icon grey.png   ▶ Development ▶ Add-on development ▶ Skinning ▶ Skins ▶ Ultra Widescreen (21:9 aspect ratio) skins for Kodi
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Kodi's skinning engine (GUI layout engine) can handle CIH (Constant Image Height) skins using resolutions with 21:9 (2.33:1) aspect ratio display output for CHP (Constant Height Projection) / CHD (Constant Height Display). Displays supporting this type of input are now more commonly known today as "Ultra Widescreen" or "Cinema Widescreen". And this and the similar aspect ratios to 21:9 (2.33:1) are known in cinema and movie-theater terminology as CinemaScope (2.35:1 / 2.35 Scope), Panavision, Cinerama, Technirama, Anamorphic Widescreen (2.39:1), Cinema Display, and Cinema 21:9, or simply 2.39 aspect ratio, and it is also incorrect described (rounded) as 2.40:1 or 2.40 for Blu-ray Disc film releases (1920×800 resolution).

Skins supporting these aspect ratios CIH for CHP/CID output from Kodi is designed to show films/movies recorded in CinemaScope or the modern anamorphic format of 2.39:1, and a anamorphic vertical stretch 21:9 television or projector which allows for displaying all content at equal height, allowing for a more balanced viewing experience. The main benefit of this screen ratio is the absence of the black bars at the top and bottom of the screen when viewing content in this format, and a constant display height when displaying other content with a lesser aspect ratio.[1]

Overview

The 64:27 aspect ratio is the logical extension of the existing video aspect ratios 4:3 and 16:9, as it is the third power of 4:3, where 16:9 of traditional HDTV is 4:3 squared. This allows electronic scalers to use an easily implementable 4:3 (1.33:1) scaling factor. 21:9 (2.33:1) is the approximated screen aspect ratio of the true value 64:27 (2.370:1) in comparison to the common ratio of 16:9 (1.77:1).

Film formats and 21:9

Format Aspect ratio
Cinemascope by Panavision (1950s–1970s) 2.35:1
"21:9" (64:27) / "Ultra Widescreen" televisions 2.37:1
Anamorphic, modern cinema widescreen format 2.39:1

The term "21:9" was chosen as a marketing term, probably first used by Philips. Due to its common denominator, 21:9 sounds more similar to 16:9, the aspect ratio of regular HDTVs, rather than the correct 64:27 or 21\tfrac{1}{3}:9. If it actually were 21:9, the fraction could be expressed more elegantly in the reduced form as 7:3.

Examples

This first image is an example of a native CinemaScope (2.35:1) video shown in Kodi using an 21:9 aspect ratio skin when displayed on a Ultra Widescreen screen with CIH (Constant Image Height). Skins can of course take many forms, this is just an example.

CIH - Kung Fu Panda in 2.40 aspect ratio.jpg

This second image is an example of a native Widescreen (16.9) video shown in Kodi using an 21:9 aspect ratio skin when displayed on a Ultra Widescreen screen with CIH (Constant Image Height). Again, the skins can of course take many forms, this is just an example.

CIH - The Witcher 3 Gameplay Video in 16.9.jpg

Resolution and Aspect Ratio

HDMI output standardization

As of May 2013, video timings in this 64:27 aspect ratio are supported by the technical specification that defines video timings for the HDMI interface, CEA 861-F:[2]

  • 1280×720p, anamorphic widescreen pixel aspect ratio of 4:3
  • 1680×720p, near-square pixel aspect ratio of 64:27
  • 1920×1080p, anamorphic pixel aspect ratio of 4:3
  • 2560×1080p, square pixel aspect ratio
  • 3840×2160p, anamorphic pixel aspect ratio of 4:3

All of the above timings are supported at frame rates of 23.97/24, 25, 29.97/30, 50 and 59.94/60 Hz, as well as 100 and 119.88/120 Hz for the non-UltraHD timings.

An additional resolution of 5120×2160p ("5K") could be added at a later time to provide a non-anamorphic UltraHD signal in 21:9. Variations of the 8K UltraHD resultions could also be considered, at 7680×4320p anamorphic and 10240x4320p non-anamorphic.

Resolution and Aspect Ratio Explained

Video by the ProjectorPeople.com which does a good job at explaining resolution and aspect ratio:

Kodi skins supporting 21:9 aspect ratio

Aeon Nox 21:9

Aeon Nox 21-9 image 1.jpg

Alaska 21:9

Alaska 21-9 image 1.png

WIP and POC skins for 2.35 aspect ratios:

Numax - pure.cinema

"Numax - pure.cinema" proof-of-concept 2:35.1 CIH format skin by DoghouseCinema

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References

Template:Reflist

See also

Users:

Development:

External Links