ΔEITP is Now Ratified as ITU-R BT.2124—Is the Industry Ready to Move on from ΔE2000?

Metadata

Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: SMPTE Mot. Imag. J
Volume: 129, No. 10, pp. 47–58
Abstract: For many years, \Delta E 2000 has been considered the industry standard for estimating perceptual color differences and evaluating the color accuracy of display technologies. Recently, the International Telecommunication Union (ITU) released Recommendation ITU-R BT.2124, which defines a new metric, \Delta E_ITP, as the new standard for evaluating perceptual color differences. Given this new recommendation, it is important that we become familiar with how \Delta E_ITP performs in practice and what can be expected when using it in existing workflows. A key part in this process is having an understanding of the properties of the color space that the color difference metric is based on and how that relates to the intended application of the metric. In this paper, we explore this relationship as it pertains to the \Delta E2000 and \Delta E_ITP color difference metrics, specifically in the context of evaluating color reproduction on self-luminous displays. Simulated data and measured data from calibrated displays are used to compare the performance of the metrics. Given that \Delta E 2000 and \Delta E_ITP are based on significantly different derivation principles, there are notable differences that must be acknowledged between these two metrics, especially as we transition between them. It is highly likely that \Delta E 2000 has been underpredicting perceptual color differences, significantly so when used for the evaluation of high dynamic range (HDR) and wide color gamut (WCG) displays.
Publication Date: 2020-11-01
DOI: 10.5594/JMI.2020.3023371
ISSN: Print: 1545-0279 | Electronic: 2160-2492
Link: https://doi.org/10.5594/JMI.2020.3023371
Author(s): Catherine Meininger
bio
Catherine Meininger is a color scientist with Portrait Displays, Edmonds, WA. Although her main interests are in audio and video post-production, she developed a passion for the perceptual side of the industry and focuses her research on color science and psychophysics. In 2018, she received a BS degree in motion picture science from the Rochester Institute of Technology (RIT), Rochester, NY. While attending school, she was an active member of RIT’s SMPTE Student Chapter and served as its president. In 2017, she was a recipient of the SMPTE Louis F. Wolf Jr. Memorial Scholarship. In 2018, she received an Honorable Mention in the Student Award competition for her thesis on chromatic noise perception.
Tyler Pruitt
bio
Tyler Pruitt’s role at Portrait Displays is as technical evangelist for the company’s Calman display calibration software, as well as Portrait’s many other color accuracy solutions. He is also Portrait’s main liaison to Hollywood and the content creation industry, including broadcast, production, post-production, and visual effects. For his company’s high dynamic range (HDR) efforts, he was deeply involved in the development of calibration processes, Calman workflows, and measurement methodologies for Dolby Vision, HDR10, and Hybrid-Log-Gamma (HLG).
Vincent Teoh
bio
Vincent Teoh is a TV technologist, professional display calibrator, and audio/video (AV) journalist. He runs the popular HDTVTest channel on YouTube and has established himself as a leading authority on TV technology with more than 200,000 subscribers. He also organizes and hosts the annual U.K. TV shootout, which crowns the best-performing consumer TV each year in terms of picture quality. In addition, he provides professional display calibration service for home and commercial clients throughout the U.K.
Keyword(s): Calibration, CIELAB, Color Difference Metric, Delta E2000, ΔEITP, HDR, ICTCP, Wide Color Gamut
Copyright: © 2020 SMPTE

Bibliographic Reference(s)

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Catherine Meininger, Tyler Pruitt, and Vincent Teoh; ΔEITP is Now Ratified as ITU-R BT.2124—Is the Industry Ready to Move on from ΔE2000?, SMPTE Motion Imaging Journal ( Volume: 129, Issue: 10, 2020); SMPTE, 2020. Available at https://doi.org/10.5594/JMI.2020.3023371

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Catherine Meininger, Tyler Pruitt, and Vincent Teoh; ΔEITP is Now Ratified as ITU-R BT.2124—Is the Industry Ready to Move on from ΔE2000?, SMPTE Motion Imaging Journal ( Volume: 129, Issue: 10, 2020); SMPTE, 2020. Available at https://doi.org/10.5594/JMI.2020.3023371

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<span class="citation">Catherine Meininger, Tyler Pruitt, and Vincent Teoh; <cite>ΔEITP is Now Ratified as ITU-R BT.2124—Is the Industry Ready to Move on from ΔE2000?</cite>, SMPTE Motion Imaging Journal ( Volume: 129, Issue: 10, 2020); SMPTE, 2020. Available at <a href="https://doi.org/10.5594/JMI.2020.3023371" target="_blank" rel="noopener">https://doi.org/10.5594/JMI.2020.3023371</a></span>

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Catherine Meininger, Tyler Pruitt, and Vincent Teoh; ΔEITP is Now Ratified as ITU-R BT.2124—Is the Industry Ready to Move on from ΔE2000?, SMPTE Motion Imaging Journal ( Volume: 129, Issue: 10, 2020); SMPTE, 2020
doi: 10.5594/JMI.2020.3023371
url: https://doi.org/10.5594/JMI.2020.3023371

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Catherine Meininger, Tyler Pruitt, and Vincent Teoh; <cite id="bib-10-5594-jmi-2020-3023371">ΔEITP is Now Ratified as ITU-R BT.2124—Is the Industry Ready to Move on from ΔE2000?</cite>, SMPTE Motion Imaging Journal ( Volume: 129, Issue: 10, 2020); SMPTE, 2020
<span class="doi">10.5594/JMI.2020.3023371</span>
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