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Excited to release Blend - a SassCSS implementation of CSS Colors Level 4 & 5 functions. Convert LCH & Lab to Sass, adjust Sass colors using LCH/Lab channels, & choose colors based on contrast. More color-spaces (like display-p3!) & tools coming soon! oddbird.net/blend/
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If you're new to LCH and other color-spaces, LeaVerou has the best introduction & visual color-picker: lea.verou.me/2020/04/lch-colors-in-css-what-why-and-how/ This tool is largely inspired by her work, along with conversion logic by svgeesus, & gamut-correction by tabatkins.
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If you're into pushing Sass too far: check out the array utils (including map/reduce), and matrix math. :)