<?php
namespace Spatie\Color;
class Convert
{
public static function CIELabValueToXyz(float $l, float $a, float $b): array
{
$y = ($l + 16) / 116;
$x = $a / 500 + $y;
$z = $y - $b / 200;
if (pow($y, 3) > 0.008856) {
$y = pow($y, 3);
} else {
$y = ($y - 16 / 116) / 7.787;
}
if (pow($x, 3) > 0.008856) {
$x = pow($x, 3);
} else {
$x = ($x - 16 / 116) / 7.787;
}
if (pow($z, 3) > 0.008856) {
$z = pow($z, 3);
} else {
$z = ($z - 16 / 116) / 7.787;
}
$x = round(95.047 * $x, 4);
$y = round(100.000 * $y, 4);
$z = round(108.883 * $z, 4);
if ($x > 95.047) {
$x = 95.047;
}
if ($y > 100) {
$y = 100;
}
if ($z > 108.883) {
$z = 108.883;
}
return [$x, $y, $z];
}
public static function cmykValueToRgb(float $cyan, float $magenta, float $yellow, float $key): array
{
return [
(int) (255 * (1 - $cyan) * (1 - $key)),
(int) (255 * (1 - $magenta) * (1 - $key)),
(int) (255 * (1 - $yellow) * (1 - $key)),
];
}
public static function rgbValueToCmyk($red, $green, $blue): array
{
$red /= 255;
$green /= 255;
$blue /= 255;
$black = 1 - max($red, $green, $blue);
$keyNeg = (1 - $black);
return [
(1 - $red - $black) / ($keyNeg ?: 1),
(1 - $green - $black) / ($keyNeg ?: 1),
(1 - $blue - $black) / ($keyNeg ?: 1),
$black,
];
}
public static function hexChannelToRgbChannel(string $hexValue): int
{
return hexdec($hexValue);
}
public static function rgbChannelToHexChannel(int $rgbValue): string
{
return str_pad(dechex($rgbValue), 2, '0', STR_PAD_LEFT);
}
public static function hexAlphaToFloat(string $hexAlpha): float
{
return round(static::hexChannelToRgbChannel($hexAlpha) / 255, 2);
}
public static function floatAlphaToHex(float $floatAlpha): string
{
return static::rgbChannelToHexChannel(round($floatAlpha * 255, 0));
}
public static function hsbValueToRgb($hue, $saturation, $brightness)
{
while ($hue > 360) {
$hue -= 360.0;
}
while ($hue < 0) {
$hue += 360.0;
}
$hue /= 360;
$saturation /= 100;
$brightness /= 100;
if ($saturation == 0) {
$R = $G = $B = $brightness * 255;
} else {
$hue = $hue * 6;
$i = floor($hue);
$j = $brightness * (1 - $saturation);
$k = $brightness * (1 - $saturation * ($hue - $i));
$l = $brightness * (1 - $saturation * (1 - ($hue - $i)));
switch ($i) {
case 0:
$red = $brightness;
$green = $l;
$blue = $j;
break;
case 1:
$red = $k;
$green = $brightness;
$blue = $j;
break;
case 2:
$red = $j;
$green = $brightness;
$blue = $l;
break;
case 3:
$red = $j;
$green = $k;
$blue = $brightness;
break;
case 4:
$red = $l;
$green = $j;
$blue = $brightness;
break;
default:
$red = $brightness;
$green = $j;
$blue = $k;
break;
}
$R = $red * 255;
$G = $green * 255;
$B = $blue * 255;
}
return [round($R), round($G), round($B)];
}
public static function hslValueToRgb(float $hue, float $saturation, float $lightness): array
{
$h = intval((360 + (intval($hue) % 360)) % 360); // hue values can be less than 0 and greater than 360. This normalises them into the range 0-360.
$c = (1 - abs(2 * ($lightness / 100) - 1)) * ($saturation / 100);
$x = $c * (1 - abs(fmod($h / 60, 2) - 1));
$m = ($lightness / 100) - ($c / 2);
if ($h >= 0 && $h <= 60) {
return [round(($c + $m) * 255), round(($x + $m) * 255), round($m * 255)];
}
if ($h > 60 && $h <= 120) {
return [round(($x + $m) * 255), round(($c + $m) * 255), round($m * 255)];
}
if ($h > 120 && $h <= 180) {
return [round($m * 255), round(($c + $m) * 255), round(($x + $m) * 255)];
}
if ($h > 180 && $h <= 240) {
return [round($m * 255), round(($x + $m) * 255), round(($c + $m) * 255)];
}
if ($h > 240 && $h <= 300) {
return [round(($x + $m) * 255), round($m * 255), round(($c + $m) * 255)];
}
if ($h > 300 && $h <= 360) {
return [round(($c + $m) * 255), round($m * 255), round(($x + $m) * 255)];
}
}
public static function rgbValueToHsb($red, $green, $blue): array
{
$red /= 255;
$green /= 255;
$blue /= 255;
$min = min($red, $green, $blue);
$max = max($red, $green, $blue);
$delMax = $max - $min;
$brightness = $max;
$hue = 0;
if ($delMax == 0) {
$hue = 0;
$saturation = 0;
} else {
$saturation = $delMax / $max;
$delR = ((($max - $red) / 6) + ($delMax / 2)) / $delMax;
$delG = ((($max - $green) / 6) + ($delMax / 2)) / $delMax;
$delB = ((($max - $blue) / 6) + ($delMax / 2)) / $delMax;
if ($red == $max) {
$hue = $delB - $delG;
} else {
if ($green == $max) {
$hue = (1 / 3) + $delR - $delB;
} else {
if ($blue == $max) {
$hue = (2 / 3) + $delG - $delR;
}
}
}
if ($hue < 0) {
$hue++;
}
if ($hue > 1) {
$hue--;
}
}
return [round($hue, 2) * 360, round($saturation, 2) * 100, round($brightness, 2) * 100];
}
public static function rgbValueToHsl($red, $green, $blue): array
{
$r = $red / 255;
$g = $green / 255;
$b = $blue / 255;
$cmax = max($r, $g, $b);
$cmin = min($r, $g, $b);
$delta = $cmax - $cmin;
$hue = 0;
if ($delta != 0) {
if ($r === $cmax) {
$hue = 60 * fmod(($g - $b) / $delta, 6);
$hue = $hue < 0 ? $hue + 360 : $hue ;
}
if ($g === $cmax) {
$hue = 60 * ((($b - $r) / $delta) + 2);
}
if ($b === $cmax) {
$hue = 60 * ((($r - $g) / $delta) + 4);
}
}
$lightness = ($cmax + $cmin) / 2;
$saturation = 0;
if ($lightness > 0 && $lightness < 1) {
$saturation = $delta / (1 - abs((2 * $lightness) - 1));
}
return [$hue, min($saturation, 1) * 100, min($lightness, 1) * 100];
}
public static function rgbValueToXyz($red, $green, $blue): array
{
$red = $red / 255;
$green = $green / 255;
$blue = $blue / 255;
if ($red > 0.04045) {
$red = pow((($red + 0.055) / 1.055), 2.4);
} else {
$red = $red / 12.92;
}
if ($green > 0.04045) {
$green = pow((($green + 0.055) / 1.055), 2.4);
} else {
$green = $green / 12.92;
}
if ($blue > 0.04045) {
$blue = pow((($blue + 0.055) / 1.055), 2.4);
} else {
$blue = $blue / 12.92;
}
$red = $red * 100;
$green = $green * 100;
$blue = $blue * 100;
$x = round($red * 0.4124 + $green * 0.3576 + $blue * 0.1805, 4);
$y = round($red * 0.2126 + $green * 0.7152 + $blue * 0.0722, 4);
$z = round($red * 0.0193 + $green * 0.1192 + $blue * 0.9505, 4);
if ($x > 95.047) {
$x = 95.047;
}
if ($y > 100) {
$y = 100;
}
if ($z > 108.883) {
$z = 108.883;
}
return [$x, $y, $z];
}
public static function xyzValueToCIELab(float $x, float $y, float $z): array
{
$x = $x / 95.047;
$y = $y / 100.000;
$z = $z / 108.883;
if ($x > 0.008856) {
$x = pow($x, 1 / 3);
} else {
$x = (7.787 * $x) + (16 / 116);
}
if ($y > 0.008856) {
$y = pow($y, 1 / 3);
} else {
$y = (7.787 * $y) + (16 / 116);
}
if ($y > 0.008856) {
$l = (116 * $y) - 16;
} else {
$l = 903.3 * $y;
}
if ($z > 0.008856) {
$z = pow($z, 1 / 3);
} else {
$z = (7.787 * $z) + (16 / 116);
}
$l = round($l, 2);
$a = round(500 * ($x - $y), 2);
$b = round(200 * ($y - $z), 2);
return [$l, $a, $b];
}
public static function xyzValueToRgb(float $x, float $y, float $z): array
{
$x = $x / 100;
$y = $y / 100;
$z = $z / 100;
$r = $x * 3.2406 + $y * -1.5372 + $z * -0.4986;
$g = $x * -0.9689 + $y * 1.8758 + $z * 0.0415;
$b = $x * 0.0557 + $y * -0.2040 + $z * 1.0570;
if ($r > 0.0031308) {
$r = 1.055 * pow($r, (1 / 2.4)) - 0.055;
} else {
$r = 12.92 * $r;
}
if ($g > 0.0031308) {
$g = 1.055 * pow($g, (1 / 2.4)) - 0.055;
} else {
$g = 12.92 * $g;
}
if ($b > 0.0031308) {
$b = 1.055 * pow($b, (1 / 2.4)) - 0.055;
} else {
$b = 12.92 * $b;
}
$r = intval(max(0, min(255, $r * 255)));
$g = intval(max(0, min(255, $g * 255)));
$b = intval(max(0, min(255, $b * 255)));
return [$r, $g, $b];
}
}
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