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(   $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(   $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; ?> |
Output:
Reference: https://www.php.net/manual/en/imagick.getpixelregioniterator.php
