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];
}

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。

@Mohsen代码的PHP实现(包括Test!)

很抱歉重新发布这篇文章。但我真的没有看到任何其他实现可以提供我所需的质量。

/**
 * 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 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 $p;
        }
function hslToRgb($h, $s, $l){
    if($s == 0){
        $r = $l;
        $g = $l;
        $b = $l; // achromatic
    }else{
        $q = $l < 0.5 ? $l * (1 + $s) : $l + $s - $l * $s;
        $p = 2 * $l - $q;
        $r = hue2rgb($p, $q, $h + 1/3);
        $g = hue2rgb($p, $q, $h);
        $b = hue2rgb($p, $q, $h - 1/3);
    }

    return array(round($r * 255), round($g * 255), round($b * 255));
}

/* Uncomment to test * /
for ($i=0;$i<360;$i++) {
  $rgb=hslToRgb($i/360, 1, .9);
  echo '<div style="background-color:rgb(' .$rgb[0] . ', ' . $rgb[1] . ', ' . $rgb[2] . ');padding:2px;"></div>';
}
/* End Test */

当你需要RGB到HSV，反之亦然:

function rgbToHsv(r, g, b)
{
    r /= 255, g /= 255, b /= 255;

    var min = Math.min(r, g, b),
    max = Math.max(r, g, b),
    delta = max - min,
    h = 0, s = 0, v = max;

    if (min != max)
    {
        s = (delta / max);

        switch (max)
        {
            case r: h = (g - b) / delta + (g < b ? 6 : 0); break;
            case g: h = (b - r) / delta + 2; break;
            case b: h = (r - g) / delta + 4; break;
        }

        h /= 6;
    }

    return [h, s, v];
}

function hsvToRgb(h, s, v)
{
    var step = h / (1 / 6),
    pos = step - Math.floor(step), // the hue position within the current step
    m = (Math.floor(step) % 2) ? (1 - pos) * v : pos * v, // mix color value adjusted to the brightness(v)
    max = 1 * v,
    min = (1 - s) * v,
    med = m + ((1 - s) * (v - m)),
    r, g, b;

    switch (Math.floor(step))
    {
        case 0:
            r = max;
            g = med;
            b = min;
            break;
        case 1:
            r = med;
            g = max;
            b = min;
            break;
        case 2:
            r = min;
            g = max;
            b = med;
            break;
        case 3:
            r = min;
            g = med;
            b = max;
            break;
        case 4:
            r = med;
            g = min;
            b = max;
            break;
        case 5:
            r = max;
            g = min;
            b = med;
            break;
    }

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

Chris的c#代码的Php实现

也是从这里，这很好地解释了它的数学原理。

这基本上是一堆转换HSL(色相饱和度亮度)的函数

在PHP 5.6.15上测试并使用

TL;DR:完整的代码可以在Pastebin上找到。

##Hex to HSL 输入:十六进制颜色，格式:[#]0f4或[#]00ff44(磅号可选) 输出:HSL的程度，百分比，百分比

/**
* Input: hex color
* Output: hsl(in ranges from 0-1)
* 
* Takes the hex, converts it to RGB, and sends
* it to RGBToHsl.  Returns the output.
* 
*/
function hexToHsl($hex) {
    $r = "";
    $g = "";
    $b = "";

    $hex = str_replace('#', '', $hex);
    
    if (strlen($hex) == 3) {
        $r = substr($hex, 0, 1);
        $r = $r . $r;
        $g = substr($hex, 1, 1);
        $g = $g . $g;
        $b = substr($hex, 2, 1);
        $b = $b . $b;
    } elseif (strlen($hex) == 6) {
        $r = substr($hex, 0, 2);
        $g = substr($hex, 2, 2);
        $b = substr($hex, 4, 2);
    } else {
        return false;
    }

    $r = hexdec($r);
    $g = hexdec($g);
    $b = hexdec($b);

    $hsl =  rgbToHsl($r,$g,$b);
    return $hsl;
}

RGB到HSL

输入:RGB，范围0-255 输出:HSL的程度，百分比，百分比。

/**
* 
*Credits:
* https://stackoverflow.com/questions/4793729/rgb-to-hsl-and-back-calculation-problems
* http://www.niwa.nu/2013/05/math-behind-colorspace-conversions-rgb-hsl/
*
* Called by hexToHsl by default.
*
* Converts an RGB color value to HSL. Conversion formula
* adapted from http://www.niwa.nu/2013/05/math-behind-colorspace-conversions-rgb-hsl/.
* Assumes r, g, and b are contained in the range [0 - 255] and
* returns h, s, and l in the format Degrees, Percent, Percent.
*
* @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){  
    //For the calculation, rgb needs to be in the range from 0 to 1. To convert, divide by 255 (ff). 
    $r /= 255;
    $g /= 255;
    $b /= 255;
    
    $myMax = max($r, $g, $b);
    $myMin = min($r, $g, $b);
    
    $maxAdd = ($myMax + $myMin);
    $maxSub = ($myMax - $myMin);
    
    //luminence is (max + min)/2
    $h = 0;
    $s = 0;
    $l = ($maxAdd / 2.0);
    
    //if all the numbers are equal, there is no saturation (greyscale).
    if($myMin != $myMax){
        if ($l < 0.5) {
            $s = ($maxSub / $maxAdd);
        } else {
            $s = (2.0 - $myMax - $myMin); //note order of opperations - can't use $maxSub here
            $s = ($maxSub / $s);
        }
        
        //find hue
        switch($myMax){
            case $r: 
                $h = ($g - $b);
                $h = ($h / $maxSub);
                break;
            case $g: 
                $h = ($b - $r); 
                $h = ($h / $maxSub);
                $h = ($h + 2.0);
                break;
            case $b: 
                $h = ($r - $g);
                $h = ($h / $maxSub); 
                $h = ($h + 4.0);
                break;
        } 
    }
    
    $hsl = hslToDegPercPerc($h, $s, $l);
    return $hsl;
}

##HSL(0-1范围)到程度，百分比，百分比格式

对于数学计算，HSL在0-1范围内更容易处理，但对于人类可读性而言，在Degrees, Percent, Percent中更容易处理。该函数接受范围为0-1的HSL，并返回以度、百分比、百分比为单位的HSL。

/**
* Input: HSL in ranges 0-1.
* Output: HSL in format Deg, Perc, Perc.
* 
* Note: rgbToHsl calls this function by default.
* 
* Multiplies $h by 60, and $s and $l by 100.
*/
function hslToDegPercPerc($h, $s, $l) {
    //convert h to degrees
    $h *= 60;
    
    if ($h < 0) {
        $h += 360;
    }
    
    //convert s and l to percentage
    $s *= 100;
    $l *= 100;
    
    $hsl['h'] = $h;
    $hsl['s'] = $s;
    $hsl['l'] = $l;
    return $hsl;
}

##HSL(度，百分比，百分比格式)到范围为0-1的HSL

该函数将格式为Degrees, Percent, Percent的HSL转换为0-1的范围，以便于计算。

/**
* Input: HSL in format Deg, Perc, Perc
* Output: An array containing HSL in ranges 0-1
* 
* Divides $h by 60, and $s and $l by 100.
* 
* hslToRgb calls this by default.
*/
function degPercPercToHsl($h, $s, $l) { 
    //convert h, s, and l back to the 0-1 range
    
    //convert the hue's 360 degrees in a circle to 1
    $h /= 360;
    
    //convert the saturation and lightness to the 0-1 
    //range by multiplying by 100
    $s /= 100;
    $l /= 100;
    
    $hsl['h'] =  $h;
    $hsl['s'] = $s;
    $hsl['l'] = $l;
    
    return $hsl;
}

##HSL到RGB

输入:格式为度，百分比，百分比的HSL 输出:RGB，格式为255,255,255。

/**
* Converts an HSL color value to RGB. Conversion formula
* adapted from http://www.niwa.nu/2013/05/math-behind-colorspace-conversions-rgb-hsl/.
* Assumes h, s, and l are in the format Degrees,
* Percent, Percent, and returns r, g, and b in 
* the range [0 - 255].
*
* Called by hslToHex by default.
*
* Calls: 
*   degPercPercToHsl
*   hueToRgb
*
* @param   Number  h       The hue value
* @param   Number  s       The saturation level
* @param   Number  l       The luminence
* @return  Array           The RGB representation
*/
function hslToRgb($h, $s, $l){
    $hsl = degPercPercToHsl($h, $s, $l);
    $h = $hsl['h'];
    $s = $hsl['s'];
    $l = $hsl['l'];

    //If there's no saturation, the color is a greyscale,
    //so all three RGB values can be set to the lightness.
    //(Hue doesn't matter, because it's grey, not color)
    if ($s == 0) {
        $r = $l * 255;
        $g = $l * 255;
        $b = $l * 255;
    }
    else {
        //calculate some temperary variables to make the 
        //calculation eaisier.
        if ($l < 0.5) {
            $temp2 = $l * (1 + $s);
        } else {
            $temp2 = ($l + $s) - ($s * $l);
        }
        $temp1 = 2 * $l - $temp2;
        
        //run the calculated vars through hueToRgb to
        //calculate the RGB value.  Note that for the Red
        //value, we add a third (120 degrees), to adjust 
        //the hue to the correct section of the circle for
        //red.  Simalarly, for blue, we subtract 1/3.
        $r = 255 * hueToRgb($temp1, $temp2, $h + (1 / 3));
        $g = 255 * hueToRgb($temp1, $temp2, $h);
        $b = 255 * hueToRgb($temp1, $temp2, $h - (1 / 3));
    }
        
    $rgb['r'] = $r;
    $rgb['g'] = $g;
    $rgb['b'] = $b;

    return $rgb;
}

###色调到RGB

hslToRgb调用此函数将色调转换为单独的RGB值。

/**
* Converts an HSL hue to it's RGB value.  
*
* Input: $temp1 and $temp2 - temperary vars based on 
* whether the lumanence is less than 0.5, and 
* calculated using the saturation and luminence
* values.
*  $hue - the hue (to be converted to an RGB 
* value)  For red, add 1/3 to the hue, green 
* leave it alone, and blue you subtract 1/3 
* from the hue.
*
* Output: One RGB value.
*
* Thanks to Easy RGB for this function (Hue_2_RGB).
* http://www.easyrgb.com/index.php?X=MATH&$h=19#text19
*
*/
function hueToRgb($temp1, $temp2, $hue) {
    if ($hue < 0) { 
        $hue += 1;
    }
    if ($hue > 1) {
        $hue -= 1;
    }
    
    if ((6 * $hue) < 1 ) {
        return ($temp1 + ($temp2 - $temp1) * 6 * $hue);
    } elseif ((2 * $hue) < 1 ) {
        return $temp2;
    } elseif ((3 * $hue) < 2 ) {
        return ($temp1 + ($temp2 - $temp1) * ((2 / 3) - $hue) * 6);
    }
    return $temp1;
}

##HSL到Hex

输入:HSL格式的度，百分比，百分比 输出:十六进制格式00ff22(没有磅号)。

转换为RGB，然后分别转换为十六进制。

/**
* Converts HSL to Hex by converting it to 
* RGB, then converting that to hex.
* 
* string hslToHex($h, $s, $l[, $prependPound = true]
* 
* $h is the Degrees value of the Hue
* $s is the Percentage value of the Saturation
* $l is the Percentage value of the Lightness
* $prependPound is a bool, whether you want a pound 
*  sign prepended. (optional - default=true)
*
* Calls: 
*   hslToRgb
*
* Output: Hex in the format: #00ff88 (with 
* pound sign).  Rounded to the nearest whole
* number.
*/
function hslToHex($h, $s, $l, $prependPound = true) {
    //convert hsl to rgb
    $rgb = hslToRgb($h,$s,$l);

    //convert rgb to hex
    $hexR = $rgb['r'];
    $hexG = $rgb['g'];
    $hexB = $rgb['b'];
    
    //round to the nearest whole number
    $hexR = round($hexR);
    $hexG = round($hexG);
    $hexB = round($hexB);
    
    //convert to hex
    $hexR = dechex($hexR);
    $hexG = dechex($hexG);
    $hexB = dechex($hexB);
    
    //check for a non-two string length
    //if it's 1, we can just prepend a
    //0, but if it is anything else non-2,
    //it must return false, as we don't 
    //know what format it is in.
    if (strlen($hexR) != 2) {
        if (strlen($hexR) == 1) {
            //probably in format #0f4, etc.
            $hexR = "0" . $hexR;
        } else {
            //unknown format
            return false;
        }
    }
    if (strlen($hexG) != 2) {
        if (strlen($hexG) == 1) {
            $hexG = "0" . $hexG;
        } else {
            return false;
        }
    }
    if (strlen($hexB) != 2) {
        if (strlen($hexB) == 1) {
            $hexB = "0" . $hexB;
        } else {
            return false;
        }
    }
    
    //if prependPound is set, will prepend a
    //# sign to the beginning of the hex code.
    //(default = true)
    $hex = "";
    if ($prependPound) {
        $hex = "#";
    }
    
    $hex = $hex . $hexR . $hexG . $hexB;
    
    return $hex;
}

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)),
  }
}