我需要一个非常轻的重量，它不是100%，但它足够接近一些用例。

float3 Hue(float h, float s, float l)
{
    float r = max(cos(h * 2 * UNITY_PI) * 0.5 + 0.5, 0);
    float g = max(cos((h + 0.666666) * 2 * UNITY_PI) * 0.5 + 0.5, 0);
    float b = max(cos((h + 0.333333) * 2 * UNITY_PI) * 0.5 + 0.5, 0);
    float gray = 0.2989 * r + 0.5870 * g + 0.1140 * b;
    return lerp(gray, float3(r, g, b), s) * smoothstep(0, 0.5, l) + 1 * smoothstep(0.5, 1, l);
}

Garry Tan在他的博客上发布了一个Javascript解决方案(他把它归为现已不存在的mjijackson.com，但存档在这里，原作者有一个要点——感谢user2441511)。

代码重新发布如下:

HSL到RGB:

/**
 * Converts an HSL color value to RGB. Conversion formula
 * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
 * Assumes h, s, and l are contained in the set [0, 1] and
 * returns r, g, and b in the set [0, 255].
 *
 * @param   {number}  h       The hue
 * @param   {number}  s       The saturation
 * @param   {number}  l       The lightness
 * @return  {Array}           The RGB representation
 */
function hslToRgb(h, s, l){
    var r, g, b;

    if(s == 0){
        r = g = b = l; // achromatic
    }else{
        var hue2rgb = function hue2rgb(p, q, t){
            if(t < 0) t += 1;
            if(t > 1) t -= 1;
            if(t < 1/6) return p + (q - p) * 6 * t;
            if(t < 1/2) return q;
            if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
            return p;
        }

        var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
        var p = 2 * l - q;
        r = hue2rgb(p, q, h + 1/3);
        g = hue2rgb(p, q, h);
        b = hue2rgb(p, q, h - 1/3);
    }

    return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
}

RGB转HSL:

/**
 * Converts an RGB color value to HSL. Conversion formula
 * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
 * Assumes r, g, and b are contained in the set [0, 255] and
 * returns h, s, and l in the set [0, 1].
 *
 * @param   {number}  r       The red color value
 * @param   {number}  g       The green color value
 * @param   {number}  b       The blue color value
 * @return  {Array}           The HSL representation
 */
function rgbToHsl(r, g, b){
    r /= 255, g /= 255, b /= 255;
    var max = Math.max(r, g, b), min = Math.min(r, g, b);
    var h, s, l = (max + min) / 2;

    if(max == min){
        h = s = 0; // achromatic
    }else{
        var d = max - min;
        s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
        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;
        }
        h /= 6;
    }

    return [h, s, l];
}

Mohsen代码的Java实现

注意，所有整数都声明为浮点数(即1f)，必须是浮点数，否则您将选择灰色。

HSL到RGB

 /**
 * Converts an HSL color value to RGB. Conversion formula
 * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
 * Assumes h, s, and l are contained in the set [0, 1] and
 * returns r, g, and b in the set [0, 255].
 *
 * @param h       The hue
 * @param s       The saturation
 * @param l       The lightness
 * @return int array, the RGB representation
 */
public static int[] hslToRgb(float h, float s, float l){
    float r, g, b;

    if (s == 0f) {
        r = g = b = l; // achromatic
    } else {
        float q = l < 0.5f ? l * (1 + s) : l + s - l * s;
        float p = 2 * l - q;
        r = hueToRgb(p, q, h + 1f/3f);
        g = hueToRgb(p, q, h);
        b = hueToRgb(p, q, h - 1f/3f);
    }
    int[] rgb = {to255(r), to255(g), to255(b)};
    return rgb;
}
public static int to255(float v) { return (int)Math.min(255,256*v); }

/** Helper method that converts hue to rgb */
public static float hueToRgb(float p, float q, float t) {
    if (t < 0f)
        t += 1f;
    if (t > 1f)
        t -= 1f;
    if (t < 1f/6f)
        return p + (q - p) * 6f * t;
    if (t < 1f/2f)
        return q;
    if (t < 2f/3f)
        return p + (q - p) * (2f/3f - t) * 6f;
    return p;
}

RGB到HSL

/**
 * Converts an RGB color value to HSL. Conversion formula
 * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
 * Assumes pR, pG, and bpBare contained in the set [0, 255] and
 * returns h, s, and l in the set [0, 1].
 *
 * @param pR       The red color value
 * @param pG       The green color value
 * @param pB       The blue color value
 * @return float array, the HSL representation
 */
public static float[] rgbToHsl(int pR, int pG, int pB) {
    float r = pR / 255f;
    float g = pG / 255f;
    float b = pB / 255f;

    float max = (r > g && r > b) ? r : (g > b) ? g : b;
    float min = (r < g && r < b) ? r : (g < b) ? g : b;

    float h, s, l;
    l = (max + min) / 2.0f;

    if (max == min) {
        h = s = 0.0f;
    } else {
        float d = max - min;
        s = (l > 0.5f) ? d / (2.0f - max - min) : d / (max + min);

        if (r > g && r > b)
            h = (g - b) / d + (g < b ? 6.0f : 0.0f);

        else if (g > b)
            h = (b - r) / d + 2.0f;

        else
            h = (r - g) / d + 4.0f;

        h /= 6.0f;
    }

    float[] hsl = {h, s, l};
    return hsl;
}

HSL到RGB的Typescript

以上所有选项都不能在我的代码在TS工作。

我调整了其中一个，现在它就像一个咒语:

type HslType = { h: number; s: number; l: number }

const hslToRgb = (hsl: HslType): RgbType => {
  let { h, s, l } = hsl

  // IMPORTANT if s and l between 0,1 remove the next two lines:
  s /= 100
  l /= 100

  const k = (n: number) => (n + h / 30) % 12
  const a = s * Math.min(l, 1 - l)
  const f = (n: number) =>
    l - a * Math.max(-1, Math.min(k(n) - 3, Math.min(9 - k(n), 1)))
  return {
    r: Math.round(255 * f(0)),
    g: Math.round(255 * f(8)),
    b: Math.round(255 * f(4)),
  }
}

维基百科上关于HSL和HSV的文章包含了一些公式。计算有点棘手，所以看一下现有的实现可能会有用。

对于所有说Garry Tan解决方案转换不正确从RGB到HSL和回来。这是因为他在代码中遗漏了数字的一部分。 我纠正了他的代码(javascript)。 对不起，俄语的链接，但在英语缺席- HSL-wiki

function toHsl(r, g, b)
{
    r /= 255.0;
    g /= 255.0;
    b /= 255.0;
    var max = Math.max(r, g, b);
    var min = Math.min(r, g, b);
    var h, s, l = (max + min) / 2.0;

    if(max == min)
    {
        h = s = 0; 
    }
    else
    {
        var d = max - min;
        s = (l > 0.5 ? d / (2.0 - max - min) : d / (max + min));

        if(max == r && g >= b)
        {
            h = 1.0472 * (g - b) / d ;
        }
        else if(max == r && g < b)
        {
            h = 1.0472 * (g - b) / d + 6.2832;
        }
        else if(max == g)
        {
            h = 1.0472 * (b - r) / d + 2.0944;
        }
        else if(max == b)
        {
            h = 1.0472 * (r - g) / d + 4.1888;
        }
    }
    return {
        str: 'hsl(' + parseInt(h / 6.2832 * 360.0 + 0.5) + ',' + parseInt(s * 100.0 + 0.5) + '%,' + parseInt(l * 100.0 + 0.5) + '%)',
        obj: { h: parseInt(h / 6.2832 * 360.0 + 0.5), s: parseInt(s * 100.0 + 0.5), l: parseInt(l * 100.0 + 0.5) }
    };
};