(PECL imagick 2.0.0)
ImagickPixel::setHSL — Sets the normalized HSL color
$hue
, float $saturation
, float $luminosity
)Sets the color described by the ImagickPixel object using normalized values for hue, saturation and luminosity.
hueThe normalized value for hue, described as a fractional arc (between 0 and 1) of the hue circle, where the zero value is red.
saturationThe normalized value for saturation, with 1 as full saturation.
luminosityThe normalized value for luminosity, on a scale from black at 0 to white at 1, with the full HS value at 0.5 luminosity.
成功时返回 TRUE。
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
)
Note:
Available with ImageMagick library version 6.2.9 and higher.