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Thursday, March 12 • 2:30pm - 3:20pm
Keynote Colour Group (Great Britan): Scene-referred Colour and Axiom Zero

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The modern way of acquiring, processing, and displaying digital movies tempts technicians to think that the central problem to be solved is summarized as “scene-to-screen” – that is, the goal is to accurately capture colour in front of the camera and relay that to exhibition. Even the phrase “colour reproduction” risks invoking this view. I argue that “scene-to-screen” has never been the central problem. Instead, what I call “Axiom Zero” proposes that the mastering display – not the scene – is the appropriate reference point for faithful colour. Certain emergent UHDTV/HDR schemes are confused on this point; to clarify, I offer a definition of “scene-referred colour.” Colour appearance issues are implicated: If the exhibition display or its viewing conditions differ from those of mastering, alterations are required that are not prescribed by classic colorimetry. I outline the required alterations (colour appearance transforms). These alterations are especially important for HDR, owing to the absence of a single standard for an HDR mastering reference display.

avatar for Charles Poynton

Charles Poynton

Scientist / Mathematician
Charles Poynton is an independent image and colour scientist working in video / HD / UHD / 4K / HDR / HDR / D‑cinema. Thirty years ago, he decided upon the count of 1080 image rows for HD (and thereby, “square pixels”). He was responsible for the introduction of the Adobe RGB... Read More →

Thursday March 12, 2020 2:30pm - 3:20pm GMT
NFT3/ BFI Southbank

Attendees (6)