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UHD Phase A is a set of guidelines from the Ultra HD Forum for the distribution of SDR and HDR content using Full HD 1080p and 4K UHD resolutions. It requires a color depth of 10 bits per sample, a color gamut of Rec. 709 or Rec. 2020, a frame rate of up to 60 fps, a display resolution of 1080p or 2160p and either standard dynamic range (SDR ...
SDR video with a conventional gamma curve and a bit depth of 8-bits per sample has a dynamic range of about 6 stops, assuming a luminance quantisation threshold of 5% is used. [10] A threshold of 5% is used in the paper (instead of the standard 2% threshold) to allow for the typical display being dimmer than ideal.
The Ultra HDR and ISO 21496-1 formats are encoded simultaneously in Android 15. [9] [12] AVIF is compatible with gain maps, but currently no encoder is available. [14] Apple EDR (Extreme Dynamic Range), used in macOS and iOS. [15] Apple refers to EDR as the combination of hardware and software that allows displaying SDR and HDR content on the ...
ITU-R Recommendation BT.2020, more commonly known by the abbreviations Rec. 2020 or BT.2020, defines various aspects of ultra-high-definition television (UHDTV) with standard dynamic range (SDR) and wide color gamut (WCG), including picture resolutions, frame rates with progressive scan, bit depths, color primaries, RGB and luma-chroma color representations, chroma subsamplings, and an opto ...
For a reference viewing environment the peak luminance of display should be 1000 cd/m 2 or more for small area highlights and the black level should be 0.005 cd/m 2 or less. [3] The surround light should be 5 cd/m 2 and be neutral grey at standard illuminant D 65. [3] Within each set, the documented transfer functions include an:
The term "4K" is generic and refers to any resolution with a horizontal pixel count of approximately 4,000. [4]: 2 Several different 4K resolutions have been standardized by various organizations. The terms "4K" and "Ultra HD" are used more widely in marketing than "2160p".
The Ultra HD Forum announced their guidelines for UHD Phase A which includes support for HLG. [41] [42] The Ultra HD Forum also defined HLG with a bit depth of 10-bits, and the Rec. 2020 color space. [42] The ITU announced Rec. 2100 which defines two HDR transfer functions which are HLG and PQ. [5] [30]
One of the primary advantages of HDR rendering is that details in a scene with a large contrast ratio are preserved. Without HDRR, areas that are too dark are clipped to black and areas that are too bright are clipped to white. These are represented by the hardware as a floating point value of 0.0 and 1.0 for pure black and pure white ...