![]() The NHK is planning for their UHDTV system, Super Hi-Vision, to use 12 bits per sample RGB. 11 bits per sample for the Rec. 2020 color space is below the visual modulation threshold, the ability to discern a one-value difference in luminance, for the entire luminance range. The NHK measured contrast sensitivity for the Rec. 2020 color space using Barten's equation which had previously been used to determine the bit depth for digital cinema. Since a larger color space increases the difference between colors, an increase of 1 bit per sample is needed for Rec. 2020 to equal or exceed the color precision of Rec. ![]() ĭuring the development of the Rec. 2020 color space it was decided that it would use real colors, instead of imaginary colors, so that it would be possible to show the Rec. 2020 color space on a display without the need for conversion circuitry. In coverage of the CIE 1931 color space, the Rec. 2020 color space covers 75.8%, the DCI-P3 digital cinema color space covers 53.6%, the Adobe RGB color space covers 52.1%, and the Rec. 2020 primary colors is 630 nm for the red primary color, 532 nm for the green primary color, and 467 nm for the blue primary color. The RGB primaries used by Rec. 2020 are equivalent to monochromatic light sources on the CIE 1931 spectral locus. ![]() The Rec. 2020 (UHDTV/UHD-1/UHD-2) color space can reproduce colors that cannot be shown with the Rec. System colorimetry RGB color space parameters Color space Codes 16 through 255 provide video data below the black level while codes 3,761 through 4,079 provide video data above the nominal peak. Codes 0–15 and 4,080–4,095 are used for the timing reference. ġ2 bits per sample Rec. 2020 uses video levels where the black level is defined as code 256 and the nominal peak is defined as code 3760. Codes 4 through 63 provide video data below the black level while codes 941 through 1,019 provide video data above the nominal peak. Codes 0–3 and 1,020–1,023 are used for the timing reference. ġ0 bits per sample Rec. 2020 uses video levels where the black level is defined as code 64 and the nominal peak is defined as code 940. Rec. 2020 defines a bit depth of either 10 bits per sample or 12 bits per sample. Only progressive scan frame rates are allowed. These both have an aspect ratio of 16:9 and use square pixels. Rec. 2020 is extended for high-dynamic-range (HDR) by Rec. 2100, which uses the same color primaries as Rec. 2020. The first version of Rec. 2020 was posted on the International Telecommunication Union (ITU) website on August 23, 2012, and two further editions have been published since then. 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-electronic transfer function. Rec. 2020 uses Illuminant D65 for the white point. It makes it easier for assessments and changes to be involved in every step of the process.CIE 1931 chromaticity diagram showing the Rec. 2020 (UHDTV) color space in the triangle and the location of the primary colors.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |