Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ITU-R BT.2408-4:2021
• Năm ban hành / Publication date: 2001
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: Guidance for operational practices in HDR television production
• Số trang / Page: 71
• Phạm vi áp dụng / Scope of standard: ForewordPolicy on Intellectual Property Right (IPR)SummaryTABLE OF CONTENTS1 Introduction2 Reference levels and signal format 2.1 HDR Reference White 2.2 Signal levels for line-up in production 2.3 Bit depth 2.4 Signal range 2.5 Colour representation3 Monitoring 3.1 Display of PQ signals 3.1.1 Mapping to displays with limited luminance range 3.2 Display of HLG signals 3.2.1 Display of HLG signals on SDR screens4 Image brightness 4.1 Comfortable brightness of static images 4.2 Tolerance to programme brightness shifts5 Inclusion of standard dynamic range content 5.1 Display referred mapping 5.1.1 Display referred mapping of SDR into PQ 5.1.2 Display referred mapping of SDR into HLG 5.1.2.1 Mapping without gamma adjustment 5.1.2.2 Mapping with gamma adjustment 5.1.2.3 Scaling 5.1.2.4 Simplification of the HLG mapping process 5.2 Scene referred mapping 5.2.1 Scene referred mapping of SDR into HLG 5.3 Handling negative values in format conversion 5.4 Adjustments to BT.709 cameras 5.5 Use of 8-bit content 5.6 Mapping of SDR graphics6 Conversion between PQ and HLG 6.1 Transcoding concepts 6.2 Conversion concepts using a reference condition at 1 000 cd/m2 6.3 Cameras using a common OOTF at a reference peak luminance of 1 000 cd/m2 6.4 Handling PQ signals with greater than 1 000 cd/m2 peak luminance 6.5 Possible colour differences when converting from PQ to HLG7 Transitioning from SDR BT.709 to HDR BT.2100 production 7.1 HDR focused production 7.2 SDR focused production 7.2.1 PQ production 7.2.2 HLG production 7.2.2.1 Further details for HLG production 7.3 SDR-HDR and HDR-SDR format conversion 7.3.1 PQ conversion 7.3.2 HLG conversion 7.3.3 The displayed “look” of content following format conversion 7.3.4 Signal range considerations for HDR to SDR conversion 7.4 SDR-HDR-SDR “Round-Tripping” 7.5 Hardware colour matrix compensation 7.6 Signal line-up8 Conversion practices for camera and display RGB colorimetryAnnex 1 Study to evaluate levels for PQ contentAnnex 2 Analysis of reference levels A2.1 Introduction A2.2 Analysis of reference levels A2.3 Diffuse white elements in live HLG encoded broadcast content A2.4 Diffuse white in an HDR dataset of 1 000 cd/m2 PQ encoded images A2.5 Discussion A2.6 ConclusionsAnnex 3 Two studies of skin tones, using a reflectance database and using real subjects A3.1 Study 1: using a skin tone database and an ideal model of a camera A3.2 Study 2: using human subjects and a RAW recording camera A3.3 ConclusionsAnnex 4 Study of facial skin tones in broadcast content A4.1 Facial skin tones in SDR news and information programmes in studio A4.2 Comparison of facial skin tones in HLG HDR and SDR content in a music programme A4.3 ConclusionAnnex 5 Displaying PQ - calculating the EETFAnnex 6 Comparison of the native looks of HDR and SDR production A6.1 Differences in chromaticity and saturation A6.2 Quantifying the total colour differences A6.3 Comparison with the reference colour pattern dataAnnex 7 Calculating the normalized primary matrix A7.1 Conversion of normalized linear colour signals to Recommendation ITU-R BT.2100 A7.2 Conversion of BT.2100 to arbitrary linear colour signals for display systemsReferencesGlossary