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allc

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A small typescript package for color conversion.

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/** * Calculates the a component of LAB from LCH. * The luminance component of LCH is omitted because it is unnecessary for the computation. * * This function is color space invariant. * * @param c The chroma component of LCH, non-negative, unbounded. * @param h The hue component of LCH, unbounded, in radians. * * @returns The a component of LCH. * @see https://bottosson.github.io/posts/oklab/#the-oklab-color-space */ export const toLABAFromLCH = ( c: number, h: number, ) => c * Math.cos(h); /** * Calculates the b component of LAB from LCH. * The luminance component of LCH is omitted because it is unnecessary for the computation. * * This function is color space invariant. * * @param c The chroma component of LCH, non-negative, unbounded. * @param h The hue component of LCH, unbounded, in radians. * * @returns The b component of LCH. * @see https://bottosson.github.io/posts/oklab/#the-oklab-color-space */ export const toLABBFromLCH = ( c: number, h: number, ) => c * Math.sin(h);