This paper presents an alternative simplified method to convert color spaces more quickly than using the traditional gamut mapping. The conversion is carried out in the two-dimensional xy chromaticity diagram, through an affine transformation, which remaps the color chromaticity only. The affine transformation applies to the colors of the original image the values obtained by solving two linear systems of three equations using the coordinates of the input and output color spaces. Then, these values are applied to each xy coordinate of the image color obtained from its RGB values. Purpose of this alternative method is not the colorimetric accuracy, but testing is an oversimplified version can lead to acceptable results. In image and video editing, the steps of color correction and color grading are often performed by the expert’s eye using various image editing tools and software. This approach overshadows the colorimetric aspect, focusing just on the aesthetic enhancement. The proposed alternative gamut mapping method, named Quick Gamut, will be presented through application examples.

Quick Gamut mapping for simplified color correction / M. Cereda, A. Plutino, A. Rizzi. - In: CULTURA E SCIENZE DEL COLORE / COLOR CULTURE AND SCIENCE. - ISSN 2384-9568. - 13:1(2021 Apr). ((Intervento presentato al convegno XVI Conferenza del Colore 2020 [10.23738/CCSJ.130209].

Quick Gamut mapping for simplified color correction

A. Plutino
Secondo
;
A. Rizzi
Ultimo
2021

Abstract

This paper presents an alternative simplified method to convert color spaces more quickly than using the traditional gamut mapping. The conversion is carried out in the two-dimensional xy chromaticity diagram, through an affine transformation, which remaps the color chromaticity only. The affine transformation applies to the colors of the original image the values obtained by solving two linear systems of three equations using the coordinates of the input and output color spaces. Then, these values are applied to each xy coordinate of the image color obtained from its RGB values. Purpose of this alternative method is not the colorimetric accuracy, but testing is an oversimplified version can lead to acceptable results. In image and video editing, the steps of color correction and color grading are often performed by the expert’s eye using various image editing tools and software. This approach overshadows the colorimetric aspect, focusing just on the aesthetic enhancement. The proposed alternative gamut mapping method, named Quick Gamut, will be presented through application examples.
Gamut mapping, Color correction, Image processing, Digital image, Colorimetry
Settore INF/01 - Informatica
Settore ING-INF/05 - Sistemi di Elaborazione delle Informazioni
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/835863
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