PHP | Imagick setSamplingFactors() Function

The Imagick::setSamplingFactors() function is an inbuilt function in PHP which is used to set the image sampling factors.

Syntax:

bool Imagick::setSamplingFactors( array $factors )

Parameters: This function accepts a single parameter $factors which holds an associative array containing sampling factors.

Return Value: This function returns TRUE on success.

Exceptions: This function throws ImagickException on error.

Below given programs illustrate the Imagick::setSamplingFactors() function in PHP:

Program 1:

PHP

<?php

// Create a new imagick object
$imagick = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png');

// Set the Sampling factors
$imagick->setSamplingFactors(array('6', '7', '8'));

// Get the Sampling factors
$samplingFactors = $imagick->getSamplingFactors();
print("<pre>".print_r($samplingFactors, true)."</pre>");
?>

Output:

Array
(
    [0] => 6
    [1] => 7
    [2] => 8
)

Program 2:

PHP

<?php

// Create a new imagick object
$imagick = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png');

// Set the format to jpg
$imagick->setImageFormat('jpg');

// Set the sampling factors
$imagick->setSamplingFactors(array('1x1', '2x2'));

// Save the image
$compressed = $imagick->getImageBlob();

// Create a new imagick object
$reopen = new Imagick();

$reopen->readImageBlob($compressed);

// Resize it to same size
$reopen->resizeImage(667, 184, 0, 1);

// Show the output
header("Content-Type: image/jpg");
echo $reopen->getImageBlob();
?>

Output:

Reference: https://www.php.net/manual/en/imagick.setsamplingfactors.php