function getPixelIterator($image_path) { $imagick = new \Imagick(realpath($image_path)); $imageIterator = $imagick->getPixelIterator(); /** @noinspection PhpUnusedLocalVariableInspection */ foreach ($imageIterator as $row => $pixels) { /* Loop through pixel rows */ foreach ($pixels as $column => $pixel) { /* Loop through the pixels in the row (columns) */ /** @var $pixel \ImagickPixel */ if ($column % 2) { $pixel->setColor("rgba(0, 0, 0, 0)"); /* Paint every second pixel black*/ } } $imageIterator->syncIterator(); /* Sync the iterator, this is important to do on each iteration */ } header("Content-Type: image/jpeg"); echo $imagick; }