Unity3D c#代码来自Mohsen的回答。

以下是Mohsen用c#编写的针对Unity3D的回答。它改编自上面Alec Thilenius给出的c#答案。

using UnityEngine;
using System.Collections;

public class ColorTools {

    /// <summary>
    /// Converts an HSL color value to RGB.
    /// Input: Vector4 ( X: [0.0, 1.0], Y: [0.0, 1.0], Z: [0.0, 1.0], W: [0.0, 1.0] )**strong text**
    /// Output: Color ( R: [0.0, 1.0], G: [0.0, 1.0], B: [0.0, 1.0], A: [0.0, 1.0] )
    /// </summary>
    /// <param name="hsl">Vector4 defining X = h, Y = s, Z = l, W = a. Ranges [0, 1.0]</param>
    /// <returns>RGBA Color. Ranges [0.0, 1.0]</returns>
    public static Color HslToRgba(Vector4 hsl)
    {
        float r, g, b;

        if (hsl.y == 0.0f)
            r = g = b = hsl.z;
        else
        {
            var q = hsl.z < 0.5f ? hsl.z * (1.0f + hsl.y) : hsl.z + hsl.y - hsl.z * hsl.y;
            var p = 2.0f * hsl.z - q;
            r = HueToRgb(p, q, hsl.x + 1.0f / 3.0f);
            g = HueToRgb(p, q, hsl.x);
            b = HueToRgb(p, q, hsl.x - 1.0f / 3.0f);
        }

        return new Color(r, g, b, hsl.w);
    }

    // Helper for HslToRgba
    private static float HueToRgb(float p, float q, float t)
    {
        if (t < 0.0f) t += 1.0f;
        if (t > 1.0f) t -= 1.0f;
        if (t < 1.0f / 6.0f) return p + (q - p) * 6.0f * t;
        if (t < 1.0f / 2.0f) return q;
        if (t < 2.0f / 3.0f) return p + (q - p) * (2.0f / 3.0f - t) * 6.0f;
        return p;
    }

    /// <summary>
    /// Converts an RGB color value to HSL.
    /// Input: Color ( R: [0.0, 1.0], G: [0.0, 1.0], B: [0.0, 1.0], A: [0.0, 1.0] )
    /// Output: Vector4 ( X: [0.0, 1.0], Y: [0.0, 1.0], Z: [0.0, 1.0], W: [0.0, 1.0] )
    /// </summary>
    /// <param name="rgba"></param>
    /// <returns></returns>
    public static Vector4 RgbaToHsl(Color rgba)
    {

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

        float h, s, l;
        h = s = 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 (rgba.r > rgba.g && rgba.r > rgba.b)
                h = (rgba.g - rgba.b) / d + (rgba.g < rgba.b ? 6.0f : 0.0f);

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

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

            h /= 6.0f;
        }

        return new Vector4(h, s, l, rgba.a);
    }

}

Java版本:

/*
Converts color from HSL/A format to RGB/A format
0 <= h <= 360
0 <= s, l, a <= 1
Based on: https://en.wikipedia.org/wiki/HSL_and_HSV#:~:text=%5Bedit%5D-,HSL%20to%20RGB%5Bedit%5D,-Given%20a%20color
 */
public RGB toRGB(double h, double s, double l, Double a) {
    double c = (1 - Math.abs(2 * l - 1)) * s;
    double x = c * (1 - Math.abs((h / 60) % 2 - 1));
    double m = l - c / 2;
    int[] RGBTag = Arrays.stream(getRGBTag(c, x)).mapToInt(e -> (int)Math.round((e + m) * 255)).toArray();
    return RGB(RGBTag[0], RGBTag[1], RGBTag[2], a);

}

private double[] getRGBTag(double c, double x) {
    if (h < 60) {
        return new double[] {c, x, 0};
    } else if (h < 120) {
        return new double[] {x, c, 0};
    } else if (h < 180) {
        return new double[] {0, c, x};
    } else if (h < 240) {
        return new double[] {0, x, c};
    } else if (h < 300) {
        return new double[] {x, 0, c};
    }
    return new double[] {c, 0, x};
}

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;
}

找到了最简单的方法，蟒蛇来拯救:D

colorsys。Hls_to_rgb (h, l, s) 将颜色从HLS坐标转换为RGB坐标。

我从Brandon Mathis的HSL Picker源代码中得到了这个。

它最初是用CoffeeScript编写的。我使用在线转换器将其转换为JavaScript，并拿出验证用户输入是否为有效RGB值的机制。这个答案适用于我的用例，因为我发现这篇文章上投票最多的答案不能产生有效的HSL值。

注意，它返回一个hsla值，表示不透明/透明。0是完全透明的，1是完全不透明的。

function rgbToHsl(rgb) {
  var a, add, b, diff, g, h, hue, l, lum, max, min, r, s, sat;
  r = parseFloat(rgb[0]) / 255;
  g = parseFloat(rgb[1]) / 255;
  b = parseFloat(rgb[2]) / 255;
  max = Math.max(r, g, b);
  min = Math.min(r, g, b);
  diff = max - min;
  add = max + min;
  hue = min === max ? 0 : r === max ? ((60 * (g - b) / diff) + 360) % 360 : g === max ? (60 * (b - r) / diff) + 120 : (60 * (r - g) / diff) + 240;
  lum = 0.5 * add;
  sat = lum === 0 ? 0 : lum === 1 ? 1 : lum <= 0.5 ? diff / add : diff / (2 - add);
  h = Math.round(hue);
  s = Math.round(sat * 100);
  l = Math.round(lum * 100);
  a = parseFloat(rgb[3]) || 1;
  return [h, s, l, a];
}

PHP -简短但精确

在这里，我将我的JS答案(数学细节在那里)重写为PHP -你可以在这里运行它

function hsl2rgb($h,$s,$l) 
{
  $a = $s * min($l, 1-$l);
  $k = function($n,$h) { return ($n+$h/30)%12;};
  $f = function($n) use ($h,$s,$l,$a,$k) { 
      return $l - $a * max( min($k($n,$h)-3, 9-$k($n,$h), 1),-1);
  };
  return [ $f(0), $f(8), $f(4) ];
}