php如何实现色彩空间转换

本篇内容主要讲解“PHP如何实现色彩空间转换”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“php如何实现色彩空间转换”吧!

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 class HSL {         protected $_hue;         protected $_saturation;         protected $_lightness;         public function __construct($hue=0, $saturation=0, $lightness=0) {        $this->_hue = $hue;        $this->_saturation = $saturation;        $this->_lightness = $lightness;    }         public function getHue() {        return $this->_hue;    }         public function getSaturation() {        return $this->_saturation;    }         public function getLightness() {        return $this->_lightness;    }         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;    }         public function toArray() {        return array(            'hue' => $this->getHue(),            'saturation' => $this->getSaturation(),            'lightness' => $this->getLightness()        );    } }

<?php class HSV {         protected $_hue;         protected $_saturation;         protected $_value;         public function __construct($hue=0, $saturation=0, $value=0) {        $this->_hue = $hue;        $this->_saturation = $saturation;        $this->_value = $value;    }         public function getHue() {        return $this->_hue;    }         public function getSaturation() {        return $this->_saturation;    }         public function getValue() {        return $this->_value;    }         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);    }         public function toArray() {        return array(            'hue' => $this->getHue(),            'saturation' => $this->getSaturation(),            'value' => $this->getValue()        );    } }

<?php class RGB {         protected $_red;         protected $_green;         protected $_blue;         public function __construct($red = 0, $green = 0, $blue = 0) {        $this->_red = $red;        $this->_green = $green;        $this->_blue = $blue;    }         public function getRed() {        return $this->_red;    }         public function getGreen() {        return $this->_green;    }         public function getBlue() {        return $this->_blue;    }         public function toHSL() {        $r = $this->getRed();        $g = $this->getGreen();        $b = $this->getBlue();        $rgb = array($r, $g, $b);        $max = max($rgb);        $min = min($rgb);        $diff = $max - $min;        if ($max == $min) {            $h = 0;        } else if ($max == $r && $g >= $b) {            $h = 60 * (($g - $b) / $diff);        } else if ($max == $r && $g < $b) {            $h = 60 * (($g - $b) / $diff) + 360;        } else if ($max == $g) {            $h = 60 * (($b - $r) / $diff) + 120;        } else if ($max == $b) {            $h = 60 * (($r - $g) / $diff) + 240;        } else {            throw new ErrorException("RGB conversion HSL failure!");        }        $l = ($max + $min) / 2;        if ($l == 0 || $max == $min) {            $s = 0;        } else if (0 < $l && $l <= 0.5) {            $s = $diff / (2 * $l);        } else if ($l > 0.5) {            $s = $diff / (2 - 2 * $l);        } else {            throw new ErrorException("RGB conversion HSL failure!");        }        require_once 'HSL.php';        return new HSL($h, $s, $l);    }         public function toHSV() {        $red = $this->getRed();        $green = $this->getGreen();        $blue = $this->getBlue();         $rgb = array($red, $green, $blue);        $max = max($rgb);        $min = min($rgb);        $diff = $max - $min;                 if ($max == $min) {            $hue = 0;        } else if ($max == $red && $green >= $blue) {            $hue = 60 * (($green - $blue) / $diff);        } else if ($max == $red && $green < $blue) {            $hue = 60 * (($green - $blue) / $diff) + 360;        } else if ($max == $green) {            $hue = 60 * (($blue - $red) / $diff) + 120;        } else if ($max == $blue) {            $hue = 60 * (($red - $green) / $diff) + 240;        } else {            throw new ErrorException("compute hue failure!");        }                 if ($max == 0) {            $saturation = 0;        } else {            $saturation = 1 - $min / $max;        }                 $value = $max;         require_once 'HSV.php';        return new HSV($hue, $saturation, $value);    }         public function toArray() {        return array(            'red' => $this->getRed(),            'green' => $this->getGreen(),            'blue' => $this->getBlue()        );    } }

效果测试(需要phpunit支持)

<?php require_once dirname(__FILE__) . '/../../color/RGB.php';require_once dirname(__FILE__) . '/../../color/HSL.php';require_once dirname(__FILE__) . '/../../color/HSV.php'; class HSLTest extends PHPUnit_Framework_TestCase {         protected $object;         protected function setUp() {        $this->object = new HSL(120, 1, 0.75);    }         protected function tearDown() {            }         public function testGetHue() {        $this->assertEquals(120, $this->object->getHue());    }         public function testGetSaturation() {        $this->assertEquals(1, $this->object->getSaturation());    }         public function testGetLightness() {        $this->assertEquals(0.75, $this->object->getLightness());    }         public function testToRGB() {        $this->assertEquals(new RGB(0.5, 1, 0.5), $this->object->toRGB());    }         public function testToArray() {        $this->assertEquals(array(            'hue' => 120,            'saturation' => 1,            'lightness' => 0.75                ), $this->object->toArray());    } }

<?php require_once dirname(__FILE__) . '/../../color/RGB.php';require_once dirname(__FILE__) . '/../../color/HSL.php';require_once dirname(__FILE__) . '/../../color/HSV.php'; class HSVTest extends PHPUnit_Framework_TestCase {         protected $object;         protected function setUp() {        $this->object = new HSV(120, 0.5, 1);    }         protected function tearDown() {            }         public function testGetHue() {        $this->assertEquals(120, $this->object->getHue());    }         public function testGetSaturation() {        $this->assertEquals(0.5, $this->object->getSaturation());    }         public function testGetValue() {        $this->assertEquals(1, $this->object->getValue());    }         public function testToRGB() {        $this->assertEquals(new RGB(0.5, 1, 0.5), $this->object->toRGB());    }         public function testToArray() {        $this->assertEquals(array(            'hue' => 120,            'saturation' => 0.5,            'value' => 1                ), $this->object->toArray());    } }

<?php require_once dirname(__FILE__) . '/../../color/RGB.php';require_once dirname(__FILE__) . '/../../color/HSL.php';require_once dirname(__FILE__) . '/../../color/HSV.php'; class RGBTest extends PHPUnit_Framework_TestCase {         protected $object;         protected function setUp() {        $this->object = new RGB(0.5, 1, 0.5);    }         protected function tearDown() {            }         public function testGetRed() {        $this->assertEquals(0.5, $this->object->getRed());    }         public function testGetGreen() {        $this->assertEquals(1, $this->object->getGreen());    }         public function testGetBlue() {        $this->assertEquals(0.5, $this->object->getBlue());    }         public function testToHSL() {        $this->assertEquals(new HSL(120, 1, 0.75), $this->object->toHSL());    }         public function testToHSV() {        $this->assertEquals(new HSV(120, 0.5, 1), $this->object->toHSV());    }         public function testToArray() {        $this->assertEquals(array(            'red' => 0.5,            'green' => 1,            'blue' => 0.5                ), $this->object->toArray());    } }

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