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ICC HDR Experts' Day


Introduction to HDR: challenges and opportunities

William Li

William is currently Color Technology Manager with Eastman Kodak. He brings a diverse background in engineering, physics, and systems design and leads the team responsible for developing core color technology in such products as Kodak ColorFlow Software, Kodak Proofing System, Prosper, and Matchprint Virtual.

Reverse tone mapping: state-of-the-art, current trends, and limitations

Mekides Abebe

Due to preceding dynamic range advancements of digital image acquisition devices than that of the display and printing technologies, most of the High Dynamic Range (HDR) imaging research as well as standardization efforts have been focused on perceptual modeling and compression of dynamic ranges. In recent years, however, HDR display devices have been increasingly commercialized and used by the end users. At the same time, most contents which have been available so far and being currently created have low dynamic range and suffers from various quality degradations because of sensor saturation and unprofessional acquisition setups. Therefore, the enhancement and the adaptation of standard dynamic range (SDR) contents for the new HDR systems is becoming more relevant. Accordingly, various perceptual as well as computational research are being introduced for reverse tone mapping (rTMO) and quality enhancement purposes.

In this presentation, I will be briefly reviewing the state-of-the-art and current trends of rTMO solutions. I will explain perceptual model based as well as empirical based solutions and the current machine learning based approaches. Finally, the limitations of current standards and color management systems will be discussed in rTMO scenarios.

Dr. Mekides Assefa Abebe received her PhD from University of Poitiers, France. She received her doctorate in Signal and Image Processing after successfully completing her research in high dynamic range (HDR) imaging. She is currently working as a permanent researcher at the color and visual computing laboratory of NTNU, Norway. In addition to HDR imaging, her research interest includes topics such as perceptual appearance modeling, computer vision, digital and computational imaging, and related others.

Workflows and application of the Perceptual Quantizer in complex HDR Imaging Ecosystems

Timo Kunkel
Dolby Systems

HDR has found widespread adoption in both consumer and professional imaging and display ecosystems. To facilitate this HDR experience, many of these ecosystem steps rely on the Perceptual Quantizer or ?PQ? EOTF, and since its standardization in SMPTE ST.2084, and later ITU-R Rec.2100, PQ is widely used in tools and applications related to content production, mastering, content review & approval. The EOTF is also commonly used with content deployment to consumer display devices such as TVs, mobile phones or tablets to present movies, episodic content, live broadcasts as well as video games and computer GUIs. Being an absolute EOTF, PQ can directly encode absolute luminance levels from 0 to 10,000 cd/m2, with quantization intervals following uniform detection thresholds. Due to this, calculations and transforms can refer to and draw accurate decisions, which is beneficial e.g., for content mapping.

This presentation will discuss the typical applications and high level HDR workflows of which PQ is a crucial component. This includes signal distribution as well as typical conversion and signal adjustment steps, such as signal clipping and tone-mapping approaches for consumer and professional display. Further, approaches such HDR metadata and ambient light compensation using absolute measurements of viewing environment illumination will be addressed.

Timo Kunkel is a senior color and imaging researcher in the CTO office of Dolby Labs, Inc. Over the past 15 years, he has been investigating the technical and perceptual aspects of HDR and wide color gamut imaging with focus on advanced display approaches and has been involved in developing the core concepts of what is now Dolby Vision.

Timo has published and taught about HDR concepts and technologies throughout our industry for many years. He is also a member and technical expert with the ICC, SID ICDM and IEC TC100 and 110.

In addition, he worked as a professional architecture and landscape photographer in Europe and the US, winning several prizes with images combining HDR and computational photography aspects.

He holds a PhD in Computer Science from the University of Bristol, UK, and a MSc from the University of Freiburg, Germany.

HDR Production: Choosing Format Conversion Look-Up Tables

Simon Thompson

Hybrid Log-Gamma is one of the two High Dynamic Range (HDR) formats standardised by the International Telecommunication Union. In this session we look at what Hybrid Log-Gamma is designed to achieve and how we developed a workflow that allows the production of HDR and Standard Dynamic Range (SDR) video from a single set of equipment. We will also look at the range of format transformations required to support these workflows and how the speaker thinks they will change in future.

Simon has worked at BBC Research & Development for 17 years most recently researching workflows for High Dynamic Range video production and has worked on programmes including the FIFA World Cup, UEFA European Championships, Wimbledon and The Royal Wedding.

He is currently chair of the European Broadcasting Union Video Systems group, and a member of the International Telecommunication Union Research Group 24, World Wide Web Consortium Media Group and the Digital Television Group's Production Technology group. He is also on the Editor Board for the Society of Motion Picture and Television Engineers' Motion Imaging Journal.

Simon holds a Master of Engineering degree in Electronic Engineering from the University of Southampton and is a Chartered Engineer.

Objective metrics for HDR

Chris Seeger
NBC Universal

HDR workflows: ITU vs ICC

Luke Wallis  

Wide colour gamut in HDR

Chris Bai  

Chris Bai is the Chief Color Expert and Product Manager at BenQ Corporation where he developed the first printing industry certified color management monitor from BenQ. His responsibility also includes software developing for color application in different industries, standards developing and color education. He was the Director of the R&D Division at Printing Technology Research Institution in Taiwan and a fellow researcher at Display Technology Center in Industrial Technology Research Institution. Coming from a mixed background of printing and display technology research, he believes making soft-proofing accessible is the future, and that was his mindset when designing the product. He received his BASc. in Computer Engineering from University of British Columbia, Canada, and his passion in photography had lead him into the world of color. He received his MSc. in Color Science from University of Leeds, UK. His experience and education in color science has allowed him to provide extensive color management training to printers, photographers, designers and everyone who is interested in color management.

CIE 8-18 Guidelines for definition and evaluation of HDR images

Mekides Abebe

ISO TC42 development of ISO TS 22028-5 Colour encodings for HDR still images

Nicolas Bonnier

HDR implementation on the web

Chris Lilley

Since the mid-1990s, the Web has been trapped into a Standard Dynamic Range, Narrow Color Gamut, sRGB-only world. Early attempts to expand to Wide Color Gamut and bring reliable, robust color management to the Web were largely unsuccessful. Since 2016 however, with the prevalence of wider-gamut screens on consumer electronic devices used to browse the Web, WCG on both mobile and desktop Web has started to become a reality. At the same time, largely due to pressure from Media and Entertainment companies who wanted to bring their existing HDR content to the Web platform, there has been a drive to also enable HDR on the Web. But there are key differences between movie and TV use of HDR, on the one hand, and integrating HDR content into the responsive, multi-platform, on-the-fly composited world of the Web browser. This talk will examine these challenges and give a glimpse of the way forward.

Chris Lilley is a Technical Director at the World Wide Web Consortium (W3C). Considered ?the father of SVG?, he also co-authored PNG, was co-editor of CSS2, chaired the group that developed @font-face, and co-developed WOFF. Ex Technical Architecture Group. Chris has been trying to get Color Management on the Web for two decades, and is relieved to see browsers catching up to native apps in this area in recent years. He is co-editor of CSS Color 3/4/5, co-chair of the Color on the Web community group, and is the W3C representative to the ICC. He is co-developer (with Lea Verou) of the color.js JavaScript color library.

Thoughts on HDR Colour Management Using Version 5 ICC Profiles

Max Derhak
Onyx Graphics

ICC colour management involves both definition and rendering of colors using open, cross platform mechanisms. However, HDR colour management provides various challenges using legacy V2/V4 ICC profiles involving limits in Profile Connection Space (PCS) and transform encoding. Such challenges will be discussed along with several approaches that can be used with V5 ICC profiles that directly address such challenges. Additionally, an exploration of algorithmic based tone mapping using V5 abstract profiles will be presented.


Max Derhak has worked for Onyx Graphics Inc. since 1990 where he currently functions in the role of Principal Scientist. Max has a Bachelors in Computer Science from the University of Utah, a Masters in Imaging Science at The Rochester Institute of Technology, and a PhD. in Color Science from RIT. Max admits to having a passion for both color and color technology. He was an initial contributor to the open source SampleICC and ICCXml projects which he continues to maintain. Max serves as a Co-Chair of the ICC as well as the Chair of the ICC Architecture Working Group, and has been a primary driving force in making iccMAX a reality. Max is also the initial contributor and maintainer of the iccMAX reference implementation - RefIccMAX.