The ImagickPixelIterator::__construct() function is an inbuilt function in PHP which is used create a instance of ImagickPixelIterator object. This object is used to iterate through the pixels.
Syntax:
bool ImagickPixelIterator::__construct( Imagick $wand )
Parameters:This function accepts a single parameter $wand which holds the image.
Return Value: This function returns TRUE on success.
Exceptions: This function throws ImagickException on error.
Below given programs illustrate the ImagickPixelIterator::__construct() 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 object $imageIterator = new ImagickPixelIterator($imagick);    // Loop through pixel rows foreach ($imageIterator as $row => $pixels) {        foreach ($pixels as $column => $pixel) {         // Set the color of each pixel to blue         $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(   // Create a new imagickPixelIterator object $imageIterator = new ImagickPixelIterator($imagick);   $i = 0;   // Loop through pixel rows foreach ($imageIterator as $row => $pixels) {       foreach ($pixels as $column => $pixel) {         $i++;     }       // Sync the iterator after each iteration     $imageIterator->syncIterator(); }   echo 'Total number of pixels: ' . $i; ?> |
Output:
Total number of pixels: 122728
Reference: https://www.php.net/manual/en/imagickpixeliterator.construct.php
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