Sets the normalized HSL color

# ImagickPixel::setHSL

(PECL imagick 2, PECL imagick 3)

ImagickPixel::setHSL — Sets the normalized HSL color

### 说明

public function ImagickPixel::setHSL(float `$hue`, float `$saturation`, float `$luminosity`): bool

Sets the color described by the ImagickPixel object using normalized values for hue, saturation and luminosity.

### 参数

`hue`

  The normalized value for hue, described as a fractional arc (between 0 and 1) of the hue circle, where the zero value is red.

`saturation`

  The normalized value for saturation, with 1 as full saturation.

`luminosity`

  The normalized value for luminosity, on a scale from black at 0 to white at 1, with the full HS value at 0.5 luminosity.

### 返回值

成功时返回 `true`。

### 示例

示例 #1 Use ImagickPixel::setHSL() to modify a color

    <?php

    //Create an almost pure red color
    $color = new ImagickPixel('rgb(90%, 10%, 10%)');

    //Get it's HSL values
    $colorInfo = $color->getHSL();

    //Rotate the hue by 180 degrees
    $newHue = $colorInfo['hue'] + 0.5;
    if ($newHue > 1) {
        $newHue = $newHue - 1;
    }

    //Set the ImagickPixel to the new color
    $colorInfo = $color->setHSL($newHue, $colorInfo['saturation'], $colorInfo['luminosity']);

    //Check that the new color is blue/green
    $colorInfo = $color->getcolor();
    print_r($colorInfo);

    ?>

以上示例会输出：

    Array
    (
        [r] => 26
        [g] => 230
        [b] => 230
        [a] => 255
    )

### 注释

> 注意:

> Available with ImageMagick library version 6.2.9 and higher.

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