ImagickPixel::setHSL
ImagickPixel::setHSL
(PECL imagick 2.0.0)
ImagickPixel::setHSL — Sets the normalized HSL color
Description
bool ImagickPixel::setHSL ( float $hue , float $saturation , float $luminosity )
Sets the color described by the ImagickPixel object using normalized values for hue, saturation and luminosity.
Parameters
-
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.
Return Values
Returns TRUE
on success.
Examples
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); ?>
The above example will output:
Array ( [r] => 26 [g] => 230 [b] => 230 [a] => 255 )
Notes
Note:
Available with ImageMagick library version 6.2.9 and higher.
© 1997–2017 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/imagickpixel.sethsl.php