PHP | ImagickPixelIterator syncIterator() Function

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The ImagickPixelIterator::syncIterator() function is an inbuilt function in PHP which is used to sync the pixel iterator.

Syntax:

bool ImagickPixelIterator::syncIterator( void )

Parameters:This function doesn’t accepts any parameter.

Return Value: This function returns TRUE on success.

Exceptions: This function throws ImagickException on error.

Below given programs illustrate the ImagickPixelIterator::syncIterator() function in PHP:

Program 1:

<?php 
// Create a new imagick object 
$imagick = new Imagick(); 
  
// Create a image on imagick object 
$imagick->newImage(800, 250, 'black'); 
  
$imageIterator = $imagick->getPixelIterator(); 
  
// Loop through rows pixel value 
foreach ($imageIterator as $pixels) { 
  
    // Loop through the pixels in the row value 
    foreach ($pixels as $column => $pixel) { 
  
        if ($column % 11) { 
            $pixel->setColor('yellow'); 
        } 
    } 
    // Sync the iterator after each iteration 
    $imageIterator->syncIterator(); 
} 
  
// Loop through pixel rows again for new color 
foreach ($imageIterator as $pixels) { 
    // Loop through the pixels in the row 
    foreach ($pixels as $column => $pixel) { 
        if ($column % 20) { 
            $pixel->setColor('blue'); 
        } 
    } 
  
    // Sync the iterator after each iteration 
    $imageIterator->syncIterator(); 
} 
  
// Show the output 
$imagick->setImageFormat('png'); 
header("Content-Type: image/png"); 
echo $imagick->getImageBlob(); 
?> 

Output:

Program 2:

<?php 
// Create a new imagick object 
$imagick = new Imagick( 
    'https://media.zambiatek.com/wp-content/uploads/zambiatek-13.png'); 
  
$imageIterator = $imagick->getPixelIterator(); 
  
// Loop through pixel rows 
foreach ($imageIterator as $pixels) { 
    // Loop through the pixels in the row 
    foreach ($pixels as $column => $pixel) { 
  
        // Get the current HSL 
        $HSL = $pixel->getHSL(); 
   
        // Set the HSL and change only saturation 
        $pixel->setHSL($HSL['hue'], 2, $HSL['luminosity']); 
    } 
    // Sync the iterator after each iteration 
    $imageIterator->syncIterator(); 
} 
  
// Show the output 
$imagick->setImageFormat('png'); 
header("Content-Type: image/png"); 
echo $imagick->getImageBlob(); 
?> 

Output:

Reference: https://www.php.net/manual/en/imagickpixeliterator.synciterator.php

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