ImagickPixel::setHSL

(PECL imagick 2.0.0)

Sets the normalized HSL color

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.

Returns:

Returns TRUE on success.

Notes:

Available with ImageMagick library version 6.2.9 and higher.

Examples:

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
)

Links:

http://php.net/manual/en/imagickpixel.sethsl.php

doc_php

2025-01-10 15:47:30

Comments