Making the CIE Chart Indispensable for Color Grading
Originally Aired - Sunday, April 14 | 11:30 AM - 11:50 AM PT
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As post-production evolves through the advent of wide color gamut, the advancements of broader color ranges have introduced a new layer of complexity to the process. Specifically, adjusting content to conform to specific display settings, such as ensuring content originally created for the BT.2020 color range fits within the DCI-P3 range. Today, this has become a nuanced and critical endeavor in the post-production market. Colorists must accurately gauge color deviations to decide on remapping them or allowing gamut boundary clipping. Currently, this work is handled using a combination of legacy tools and monitoring with reference monitors. This can be time-consuming and error-prone. This paper presentation will concentrate on a powerful tool that is transforming the aspect of color correction - the CIE chromaticity chart – which provides a 2D view of the chromaticity content of the image. The session will demystify this once-considered niche academic tool and demonstrate how it can revolutionize the way in which colorists work. It will start by showcasing how Gamut Excursion Measurement (GEM) utilization turns the CIE chart into an intuitive guide for identifying gamut deviations as a 2D linear chart over the spectrum of colors. Through GEM, colorists can pinpoint key regions that require their attention. This approach not only streamlines the color correction process but also greatly enhances its accuracy. When this data is visualized as a gradient false color, it creates a compelling deviation heat map. This visual aid provides colorists with a clear, at-a-glance understanding of the areas needing adjustment, eliminating the need for manual inspection and guesswork. This innovation dramatically accelerates the color grading process and reduces the likelihood of errors. Furthermore, the paper will delve into the concept of the Luma Qualified CIE. This innovative approach allows users to apply constraints to the CIE chart, narrowing the focus to specific luma ranges of interest. By doing so, colorists gain the ability to study and manipulate colors within these predefined luminance boundaries. This breakthrough enables colorists to maintain full control of the appearance and perception of colors, ensuring that the final content adheres to specific luminance standards. Integrating these advancements into the color grading workflow promises a refined, efficient, and precise color grading experience in an increasingly dynamic environment. As content creators continue to push the boundaries of color and dynamic range, tools that enable colorists to work with confidence and precision are invaluable. The GEM-enabled CIE chart, along with the Luma Qualified CIE, equips colorists to meet the demands of modern display technologies while preserving the creative intent of the content.
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