php实现色彩空间转换的方法：首先创建一个PHP示例文件；然后创建“HSL、HSV、RGB色彩空间”；最后通过“protected function tearDown(){…}”等方法实现转换。
本文操作环境：windows7系统、PHP7.1版，DELL G3电脑
php怎么实现色彩空间转换？
PHP实现RGB,HSL,HSV色彩空间转换
<?php
/**
* HSL色彩空间描述
* @author shizhuolin
*/
class HSL {
/**
* 色相 0-360
* @var float
*/
protected $_hue;
/**
* 饱和度 0-1
* @var float
*/
protected $_saturation;
/**
* 亮度 0-1
* @var float
*/
protected $_lightness;
/**
* 构造HSL色彩空间描述
* @param float $hue
* @param float $saturation
* @param float $lightness
*/
public function __construct($hue=0, $saturation=0, $lightness=0) {
$this->_hue = $hue;
$this->_saturation = $saturation;
$this->_lightness = $lightness;
}
/**
* 获取色相
* @return float
*/
public function getHue() {
return $this->_hue;
}
/**
* 获取饱和度
* @return float
*/
public function getSaturation() {
return $this->_saturation;
}
/**
* 获取亮度
* @return float
*/
public function getLightness() {
return $this->_lightness;
}
/**
* 获取RGB形式色彩空间描述
* @return RGB
*/
public function toRGB() {
$h = $this->getHue();
$s = $this->getSaturation();
$l = $this->getLightness();
if ($s == 0) {
require_once 'RGB.php';
return new RGB($l, $l, $l);
}
$q = $l < 0.5 ? $l * (1 + $s) : $l + $s - ($l * $s);
$p = 2 * $l - $q;
$hk = $h / 360;
$tR = $hk + (1 / 3);
$tG = $hk;
$tB = $hk - (1 / 3);
$tR = $this->getTC($tR);
$tG = $this->getTC($tG);
$tB = $this->getTC($tB);
$tR = $this->getColorC($tR, $p, $q);
$tG = $this->getColorC($tG, $p, $q);
$tB = $this->getColorC($tB, $p, $q);
require_once 'RGB.php';
return new RGB($tR, $tG, $tB);
}
private function getColorC($tc, $p, $q) {
if ($tc < (1 / 6)) {
return $p + (($q - $p) * 6 * $tc );
} else if ((1 / 6) <= $tc && $tc < 0.5) {
return $q;
} else if (0.5 <= $tc && $tc < (2 / 3)) {
return $p + (($q - $p) * 6 * (2 / 3 - $tc) );
} else {
return $p;
}
}
private function getTC($c) {
if ($c < 0)
$c++;
if ($c > 1)
$c--;
return $c;
}
/**
* 获取 array形式HSL色彩描述
* @return array
*/
public function toArray() {
return array(
'hue' => $this->getHue(),
'saturation' => $this->getSaturation(),
'lightness' => $this->getLightness()
);
}
}
<?php
/**
* HSV色彩空间描述
* @author shizhuolin
*/
class HSV {
/**
* 色相 0-260
* @var float
*/
protected $_hue;
/**
* 饱和度 0-1
* @var float
*/
protected $_saturation;
/**
* 色调 0-1
* @var float
*/
protected $_value;
/**
* 构造
* @param float $hue 色相
* @param float $saturation 饱和度
* @param float $value 色调
*/
public function __construct($hue=0, $saturation=0, $value=0) {
$this->_hue = $hue;
$this->_saturation = $saturation;
$this->_value = $value;
}
/**
* 获取色相 0-360
* @return float
*/
public function getHue() {
return $this->_hue;
}
/**
* 获取饱和度 0-1
* @return float
*/
public function getSaturation() {
return $this->_saturation;
}
/**
* 获取色调 0-1
* @return float
*/
public function getValue() {
return $this->_value;
}
/**
* 返回该色彩在RGB色彩空间的描述
* @return RGB
*/
public function toRGB() {
$hue = $this->getHue();
$saturation = $this->getSaturation();
$value = $this->getValue();
$hi = floor($hue / 60) % 6;
$f = $hue / 60 - $hi;
$p = $value * (1 - $saturation);
$q = $value * (1 - $f * $saturation);
$t = $value * (1 - (1 - $f) * $saturation);
switch ($hi) {
case 0:
$red = $value;
$green = $t;
$blue = $p;
break;
case 1:
$red = $q;
$green = $value;
$blue = $p;
break;
case 2:
$red = $p;
$green = $value;
$blue = $t;
break;
case 3:
$red = $p;
$green = $q;
$blue = $value;
break;
case 4:
$red = $t;
$green = $p;
$blue = $value;
break;
case 5:
$red = $value;
$green = $p;
$blue = $q;
break;
default:
throw new ErrorException('HSV Conversion RGB failure!');
break;
};
require_once 'RGB.php';
return new RGB($red, $green, $blue);
}
/**
* 返回数组形式表达
* @return array
*/
public function toArray() {
return array(
'hue<strong style="color:transparent">来源gao@daima#com搞(%代@#码网</strong>9; => $this->getHue(),
'saturation' => $this->getSaturation(),
'value' => $this->getValue()
);
}
}
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转载请注明原文链接：php怎么实现色彩空间转换
转载请注明原文链接：php怎么实现色彩空间转换
