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PHP | ImagickPixelIterator newPixelIterator() Function

  • Last Updated : 14 Jan, 2020

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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