PHP Manual: Get an ImagickPixelIterator for an image section

Description

public ImagickPixelIterator Imagick::getPixelRegionIterator(
    int $x,
    int $y,
    int $columns,
    int $rows
)

Get an ImagickPixelIterator for an image section.

Parameters

x: The x-coordinate of the region.
y: The y-coordinate of the region.
columns: The width of the region.
rows: The height of the region.

Return Values

Returns an ImagickPixelIterator for an image section.

Errors/Exceptions

Throws ImagickException on error.

Examples

Example #1 Imagick::getPixelRegionIterator example

Iterate over the pixels in the top left of the image, changing them to be black.

<?php
$im = new Imagick(realpath("./testImage.png"));
$areaIterator = $im->getPixelRegionIterator(0, 0, 10, 10);

foreach ($areaIterator as $rowIterator) {
    foreach ($rowIterator as $pixel) {
        // Paint every pixel black
        $pixel->setColor("rgba(0, 0, 0, 0)");
    }
    $areaIterator->syncIterator();
}
$im->writeImage("./output.png");
?>