PHP | ImagickPixelIterator newPixelIterator() Function

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The ImagickPixelIterator::newPixelIterator() function is an inbuilt function in PHP which is used to get a new pixel iterator to iterate pixels of a imagick image.

Syntax:

bool ImagickPixelIterator::newPixelIterator( Imagick $wand )

Parameters: This function accepts a single parameter $wand which holds the image to iterate the pixels.

Return Value: This function returns TRUE on success.

Below programs illustrate the ImagickPixelIterator::newPixelIterator() 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'); 
  
// Create a new ImagickPixelIterator instance 
$imageIterator = new ImagickPixelIterator(); 
  
// Get the pixels from the image 
$imageIterator->newPixelIterator($imagick); 
  
$i = 0; 
  
// Loop through pixel rows 
foreach ($imageIterator as $row => $pixels) { 
    $i++; 
} 
   
echo 'Total rows are ' . $i; 
?> 

Output:

Total rows are 250

Program 2:

<?php 
  
// Create a new imagick object 
$imagick = new Imagick(); 
  
// Create a image on imagick object 
$imagick->newImage(800, 250, 'black'); 
  
// Create a new ImagickPixelIterator instance 
$imageIterator = new ImagickPixelIterator(); 
  
// Get the pixels from the image 
$imageIterator->newPixelIterator($imagick); 
  
$colors = ['red', 'green', 'blue', 'yellow']; 
$i = 0; 
  
// Loop through pixel rows 
foreach ($imageIterator as $row => $pixels) { 
    
    foreach ($pixels as $column => $pixel) { 
  
        // Set the color of each pixel lines to colors 
        $pixel->setColor($colors[$i % 4]); 
    } 
    $i++; 
  
    // 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.newpixeliterator.php

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