ImagickPixel::setHSL

(PECL imagick 2.0.0)

ImagickPixel::setHSL — 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.