PHP | Imagick getPixelIterator() Function

The Imagick::getPixelIterator() function is an inbuilt function in PHP which is used to return the image MagickPixelIterator.

Syntax:

ImagickPixelIterator Imagick::getPixelIterator( void )

Parameters:This function does not accept any parameter.

Return Value: This function returns an ImagickPixelIterator value.

Errors/Exceptions: This function throws ImagickException on error.

Below programs illustrate the Imagick::getPixelIterator() function in PHP:

Program 1:

<?php

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

$imageIterator = $imagick->getPixelIterator();

// Change the color of every second pixel to green
foreach ($imageIterator as $row => $pixels) {
    foreach ($pixels as $column => $pixel) {
        if ($column % 2) {
            $pixel->setColor("green");
        }
    }
    $imageIterator->syncIterator();
}

// Display the output
header("Content-Type:image/png");
echo $imagick;
?>

Output:

Program 2:

<?php

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

$imageIterator = $imagick->getPixelIterator();

// Change the color of every second pixel to green
foreach ($imageIterator as $row => $pixels) {
    foreach ($pixels as $column => $pixel) {
        if ($row % 2) {
            $pixel->setColor("blue");
        }
    }
    $imageIterator->syncIterator();
}

// Display the output
header("Content-Type:image/png");
echo $imagick;
?>

Output:

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