@peculiar/color/dist/esnext/rgb_to_hsb.js

Library for color manipulation and conversion in JavaScript.

const RGB_MAX = 255;
const HUE_MAX = 360;
const SV_MAX = 100;
/**
 * RGB color to HSB color.
 * @example
 *  rgbToHsb(255, 255, 255) // =>
 */
export function rgbToHsb(r, g, b) {
    // It converts [0,255] format, to [0,1]
    r = (r === RGB_MAX) ? 1 : ((r % RGB_MAX) / RGB_MAX);
    g = (g === RGB_MAX) ? 1 : ((g % RGB_MAX) / RGB_MAX);
    b = (b === RGB_MAX) ? 1 : ((b % RGB_MAX) / RGB_MAX);
    const max = Math.max(r, g, b);
    const min = Math.min(r, g, b);
    const v = max;
    const d = max - min;
    const s = max === 0 ? 0 : d / max;
    let h;
    if (max === min) {
        h = 0; // achromatic
    }
    else {
        switch (max) {
            case r:
                h = (g - b) / d + (g < b ? 6 : 0);
                break;
            case g:
                h = (b - r) / d + 2;
                break;
            case b:
                h = (r - g) / d + 4;
                break;
            default:
                break;
        }
        h /= 6;
    }
    return [
        Math.round(h * HUE_MAX),
        Math.round(s * SV_MAX),
        Math.round(v * SV_MAX),
    ];
}
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