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  • ImagickPixel::setHSL()

    (PECL imagick 2.0.0)

    Sets the normalized HSL color

    说明

    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

    范例

    Example #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);
    ?>
    

    以上例程会输出:

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

    注释

    Note:

    Available with ImageMagick library version 6.2.9 and higher.