1、 Approved July 6, 2016 Copyright 2016 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 SMPTE ST 2094-30:2016 SMPTE STANDARD Dynamic Metadata for Color Volume Transform Application #3 Page 1 of 15 pages Table of Contents Foreword 2 Intel
2、lectual Property . 2 Introduction 2 1 Scope . 4 2 Conformance Notation . 4 3 Normative References . 4 4 Terms and Definitions 5 4.1 Transfer Function . 5 4.2 Input Image Essence 5 5 Application Identification . 5 6 Targeted System Display . 5 6.1 Introduction . 5 6.2 Targeted System Display Signal F
3、ormat 5 6.3 Targeted System Display Default Values . 7 7 Referenced-Based Color Volume Remapping . 7 7.1 Introduction . 7 7.2 Color Component Ordering 7 7.3 Metadata Color Coding Workspace . 7 7.4 Pre-Matrix Tone Mapping (1D LUT) . 9 7.5 Color Remapping Matrix (3x3 scalar) . 9 7.6 Post-Matrix Tone M
4、apping (1D LUT) . 9 8 Application Constraints . 10 8.1 Metadata Set . 10 8.2 Time Interval Constraints 11 8.3 Processing Window Constraints . 11 Annex A Mapping of Application #3 to the Generalized Color Volume Transform Model (Informative) . 12 Annex B Color Volume Transform Method Description (Inf
5、ormative) 13 Annex C Bibliography (Informative) 15 SMPTE ST 2094-30:2016 Page 2 of 15 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards developing organization. Headquartered and incorporated in the United States of America, SMPT
6、E has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices, and Engineering Guidelines, are prepared by SMPTEs Technology Committees. Participation in these Committees is open to all with a bona fide interest in their work. SMPTE co
7、operates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given in its Standards Operations Manual. SMPTE ST 2094-30 was prepared by Technology Committee 10E. Intellectual Property SMPTE draws atte
8、ntion to the fact that it is claimed that compliance with this Standard may involve the use of one or more patents or other intellectual property rights (collectively, “IPR“). The Society takes no position concerning the evidence, validity, or scope of this IPR. Each holder of claimed IPR has assure
9、d the Society that it is willing to License all IPR it owns, and any third party IPR it has the right to sublicense, that is essential to the implementation of this Standard to those (Members and non-Members alike) desiring to implement this Standard under reasonable terms and conditions, demonstrab
10、ly free of discrimination. Each holder of claimed IPR has filed a statement to such effect with SMPTE. Information may be obtained from the Director, Standards or when library image essence that already exists as an SDR grade is remastered to produce a grade in HDR and WCG. SMPTE ST 2094-30:2016 Pag
11、e 3 of 15 pages An example use case is a content creator producing both an “HDR grade” master for HDR home video distribution made using a reference mastering display having a peak luminance of 1000 candelas per square meter and Rec. ITU-R BT.2020 color gamut, and an “SDR grade” master for legacy SD
12、R home video distribution made using a reference mastering display having a peak luminance of 100 candelas per square meter and Rec. ITU-R BT.709 color gamut. These two graded masters are used as the input to a tool that generates the dynamic metadata for the Application #3 Reference-based Color Vol
13、ume Remapping system. This dynamic metadata can then be delivered with the “HDR grade” image essence so it can be used by a downstream SDR rendering device to provide a color volume transform so that the displayed image closely matches the artistic intent expressed in the “SDR grade” image essence.
14、Application #3 also supports the use case where the dynamic metadata is generated as part of the content creators color grading session used to produce an “SDR grade” master from the “HDR grade” master. The Reference-based Color Volume Remapping dynamic metadata related to the processing blocks desc
15、ribed above can be carried in compressed image essence encoded under the Rec. ITU-T H.265 High Efficiency Video Coding (HEVC) standard by using the Colour Remapping Information (CRI) Supplemental Enhancement Information (SEI) message defined in Rec. ITU-T H.265. The metadata set associated with Refe
16、rence-based Color Volume Remapping is specified in Section 8.1. SMPTE ST 2094-30:2016 Page 4 of 15 pages 1 Scope This standard specifies Dynamic Metadata for Color Volume Transform Application #3, Reference-based Color Volume Remapping. It is a specialization of the content-dependent transform metad
17、ata entries and processing blocks of the generalized color volume transform model defined in the SMPTE ST 2094-1 Dynamic Metadata for Color Volume Transform Core Components standard. 2 Conformance Notation Normative text is text that describes elements of the design that are indispensable or contain
18、s the conformance language keywords: “shall“, “should“, or “may“. Informative text is text that is potentially helpful to the user, but not indispensable, and can be removed, changed, or added editorially without affecting interoperability. Informative text does not contain any conformance keywords.
19、 All text in this document is, by default, normative, except: the Introduction, any section explicitly labeled as “Informative“ or individual paragraphs that start with “Note:” The keywords “shall“ and “shall not“ indicate requirements strictly to be followed in order to conform to the document and
20、from which no deviation is permitted. The keywords, “should“ and “should not“ indicate that, among several possibilities, one is recommended as particularly suitable, without mentioning or excluding others; or that a certain course of action is preferred but not necessarily required; or that (in the
21、 negative form) a certain possibility or course of action is deprecated but not prohibited. The keywords “may“ and “need not“ indicate courses of action permissible within the limits of the document. The keyword “reserved” indicates a provision that is not defined at this time, shall not be used, an
22、d may be defined in the future. The keyword “forbidden” indicates “reserved” and in addition indicates that the provision will never be defined in the future. A conformant implementation according to this document is one that includes all mandatory provisions (“shall“) and, if implemented, all recom
23、mended provisions (“should“) as described. A conformant implementation need not implement optional provisions (“may“) and need not implement them as described. Unless otherwise specified, the order of precedence of the types of normative information in this document shall be as follows: Normative pr
24、ose shall be the authoritative definition; Tables shall be next; then formal languages; then figures; and then any other language forms. 3 Normative References The following standards contain provisions which, through reference in this text, constitute provisions of this engineering document. At the
25、 time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this engineering document are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below. SMPTE ST 428-1: 2006, D-Cin
26、ema Distribution Master Image Characteristics SMPTE ST 431-1: 2006, D-Cinema Quality Screen Luminance Level, Chromaticity and Uniformity SMPTE RP 2077:2013, Full-Range Image Mapping SMPTE ST 2084:2014, High Dynamic Range Electro-Optical Transfer Function of Mastering Reference Displays SMPTE ST 2094
27、-30:2016 Page 5 of 15 pages SMPTE ST 2094-1:2016, Dynamic Metadata for Color Volume Transform Core Components Recommendation ITU-R BT.709-6 (06/2015), Parameter values for HDTV Standards for Production and International Programme Exchange Recommendation ITU-R BT.1886 (03/2011), Reference Electro-Opt
28、ical Transfer Function for Flat Panel Displays Used in HDTV Studio Production Recommendation ITU-R BT.2020-2 (10/2015), Parameter Values for Ultra-High Definition Television Systems for Production and International Programme Exchange 4 Terms and Definitions For the purposes of this document, the ter
29、ms and definitions given in SMPTE ST 2094-1, SMPTE RP 2077, and the following apply: 4.1 Transfer Function mapping of a digital code value to another quantity (e.g., luminance) 4.2 Input image essence image essence to which the color volume transform is applied 5 Application Identification The Appli
30、cationIdentifier item value shall be 3 and the ApplicationVersion item value shall be 0 to identify this version of Application #3. These two values identify this document as the defining document for the Application-specific metadata specified in Section 8.1. 6 Targeted System Display 6.1 Introduct
31、ion The TargetedSystemDisplay metadata group associated with Application #3 Reference-based Color Volume Remapping contains the metadata item defined in Section 6.2. Application of the ColorVolumeTransform (see Section 7.1) to input image essence in the MetadataColorCodingWorkspace (see Section 7.3)
32、 will result in image essence intended for a display having the characteristics identified in TargetedSystemDisplay. TargetedSystemDisplay facilitates selection of a metadata set best matching the actual targeted system display. 6.2 Targeted System Display Signal Format The TargetedSystemDisplaySign
33、alFormat value defined in Table 1 describes the characteristics of the signal format of the targeted system display for which the color volume transform output is computed. These characteristics comprise the transfer function, color components, and quantization. TargetedSystemDisplaySignalFormat sha
34、ll be an enumerator containing one value selected from the list defined in Table 1. The default value shall be 0. SMPTE ST 2094-30:2016 Page 6 of 15 pages In Table 1, n represents the component bit depth of the image essence and D = 2n-8. Table 1 Values for TargetedSystemDisplaySignalFormat Value Si
35、gnal Format of the Targeted System Display 0 The transfer function is as defined in Rec. ITU-R BT.1886 (with a=1, b=0), quantized such that a digital code value of 235 D for each of R, G, and B, or Y corresponds to reference white and a digital code value of 16 D corresponds to reference black. The
36、color components are R, G, B when the Metadata Color Coding Workspace value is 0, 1, or 2; and are Y, CB, CR when such value is 3, respectively corresponding to ER, EG, EB and EY, ECB, ECR, as specified in ITU R BT.709 6. Note: This corresponds to a narrow-range image as specified in SMPTE RP 2077,
37、for HDTV. 1 The transfer function is as defined in Rec. ITU-R BT.1886 (with a=1, b=0), quantized such that a digital code value of 235 D for each of R, G, and B, or Y corresponds to reference white and a digital code value of 16 D corresponds to reference black. The color components are R, G, B when
38、 the Metadata Color Coding Workspace value is 0, 1, or 2; and are Y, CB, CR when such value is 3, as specified in ITU R BT.2020 2 as non-constant luminance. Note: This corresponds to a narrow-range image as specified in SMPTE RP 2077, for ultra-high definition television. 2 The transfer function is
39、as defined in SMPTE ST 428-1:2006. The color components are X, Y, Z. Note: This corresponds to a 12-bit, full-range image as specified in SMPTE RP 2077, for digital cinema. 3 The transfer function is as defined in SMPTE ST 2084:2014, quantized such that a digital code value of 235 D for each of R, G
40、, and B, or Y corresponds to an optical output of 10 000 candelas per square meter (cd/m2) and a digital code value of 16 D corresponds to an optical output of 0 cd/m2. The color components are R, G, B when the Metadata Color Coding Workspace value is 0, 1, or 2; and are Y, CB, CR when such value is
41、 3, as specified in ITU R BT.2020 2 as non-constant luminance. Note: This corresponds to a narrow-range image as specified in SMPTE RP 2077, for high-dynamic range, ultra-high definition television. 4 The transfer function is as defined in SMPTE ST 2084:2014, quantized such that a digital code value
42、 of 2n - 1 for each of R, G, and B corresponds to an optical output of 10 000 cd/m2 and a digital code value of 0 corresponds to an optical output of 0 cd/m2. The color components are R, G, and B, as specified in ITU R BT.2020 2 as non-constant luminance. Note: This corresponds to a full-range image
43、 as specified in SMPTE RP 2077, for high-dynamic range, ultra-high definition television. SMPTE ST 2094-30:2016 Page 7 of 15 pages 6.3 Targeted System Display Default Values If any metadata item of the TargetedSystemDisplay group is allowably omitted, other than the TargetedSystemDisplaySignalFormat
44、 item, the omitted item shall take the default value specified in Table 2 according to the value of TargetedSystemDisplaySignalFormat. Table 2 Default Values for Omitted Targeted System Display Metadata Items Value Targeted System Display Omitted Metadata Item Defaults 0 TargetedSystemDisplayMaximum
45、Luminance: 100 cd/m2 TargetedSystemDisplayMinimumLuminance: 0.05 cd/m2 TargetedSystemDisplayPrimaries: as defined in Rec. ITU-R BT.709-6 TargetedSystemDisplayWhitePointChromaticity: as defined in Rec. ITU-R BT.709-6 1 TargetedSystemDisplayMaximumLuminance: 100 cd/m2 TargetedSystemDisplayMinimumLumin
46、ance: 0.05 cd/m2 TargetedSystemDisplayPrimaries: as defined in Rec. ITU-R BT.2020-2 TargetedSystemDisplayWhitePointChromaticity: as defined in Rec. ITU-R BT.2020-2 2 TargetedSystemDisplayMaximumLuminance: 48 cd/m2 TargetedSystemDisplayMinimumLuminance: 0.024 cd/m2 TargetedSystemDisplayPrimaries: Red
47、 = 0.6800, 0.3200, Green = 0.2650, 0.6900, Blue = 0.1500, 0.0600 (SMPTE RP 431-2:2011) TargetedSystemDisplayWhitePointChromaticity: as defined in SMPTE ST 431-1:2006 3, 4 TargetedSystemDisplayMaximumLuminance: 1000 cd/m2 TargetedSystemDisplayMinimumLuminance: 0.03 cd/m2 TargetedSystemDisplayPrimarie
48、s: as defined in Rec. ITU-R BT.2020 TargetedSystemDisplayWhitePointChromaticity: as defined in Rec. ITU-R BT.2020-2 7 Referenced-Based Color Volume Remapping 7.1 Introduction The ColorVolumeTransform metadata group associated with Application #3 Reference-based Color Volume Remapping contains the me
49、tadata items defined in Sections 7.3 to 7.6. 7.2 Color Component Ordering Color components shall have the following order in the metadata set: R, G, B, Y, CB, CR, or X, Y, Z. 7.3 Metadata Color Coding Workspace The MetadataColorCodingWorkspace item value shall specify the color components and quantization range, as defined in Table 3. This is the color image encoding for the input image essence from which the ColorVolumeTransform metadata group
