Optimizing Color Grading with the Gamut Rings Color Scope

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Publisher: SMPTE — Pasadena, CA
Doc Type: Conference Paper
Content Type: Original Research
Volume: 00, pp. 1–9
Abstract: Traditional color scopes provide limited insight into perceptual attributes of color, particularly lightness, chroma, and hue angle. To address this limitation, the Gamut Rings Color Scope offers a novel 2D visualization that simultaneously represents these three perceptual dimensions. This intuitive layout enhances the understanding of color distributions in a wide variety of image types. This paper presents a real-time software implementation of the Gamut Rings Color Scope optimized for HD video signals. The scope operates in the D65 CIELAB space to match standard video viewing conditions and employs a lookup table (LUT) for efficient mapping of input signals. Core components of the implementation include gamut boundary computation, chroma stabilization, rasterization, and index-based mapping. Comparative evaluations show how the Gamut Rings Color Scope better reveals perceptual features—such as in mid-tone gradations, hue shifts, and gamut violations—than traditional vectorscopes and chromaticity scopes. These comparisons underscore the unique advantages of the ring-based display for analyzing tone mapping, saturation changes, and high-dynamic-range (HDR) rendering behavior. By integrating the Gamut Rings Color Scope into grading workflows, colorists can gain a unified, perceptually meaningful view of color structure enabling more informed and communicative color decisions.
Publication Date: 2025-10-13
ISBN: [object Object]
Author(s): Kenichiro Masaoka
Keyword(s): Color Gamut, Gamut Rings, Color Scope, Color Grading, Color Correction
Copyright: © 2025 SMPTE

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