PHP | Imagick getPixelRegionIterator() Function

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The Imagick::getPixelRegionIterator() function is an inbuilt function in PHP which is used to get an ImagickPixelIterator for an image section.

Syntax:

ImagickPixelIterator Imagick::getPixelRegionIterator( int $x, int $y, int $columns, int $rows )

Parameters:This function accepts four parameters as mentioned above and described below:

$x: It specifies the x-coordinate of the region.
$y: It specifies the y-coordinate of the region.
$columns: It specifies the width of the region.
$rows: It specifies the height of the region.

Return Value: This function returns an ImagickPixelIterator for an image section.

Errors/Exceptions: This function throws ImagickException on error.

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

Program 1:

<?php 
  
// Create a new imagick object 
$imagick = new Imagick( 
'https://media.zambiatek.com/wp-content/uploads/20190918234528/colorize1.png'); 
  
$imageIterator = $imagick->getPixelRegionIterator(0, 0, 330, 200); 
  
// Change the color of every second pixel of region to blue 
foreach ($imageIterator as $row => $pixels) { 
    foreach ($pixels as $column => $pixel) { 
        if ($column % 2) { 
            $pixel->setColor("blue"); 
        } 
    } 
    $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.zambiatek.com/wp-content/uploads/20190918234528/colorize1.png'); 
  
$imageIterator = $imagick->getPixelRegionIterator(330, 0, 338, 200); 
  
// Change the color of every second pixel of region 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; 
?> 