Magento 2 : How to add watermark to the specific product image programmatically?

If you want to add watermark to the specific product image programmatically, then use below script.

<?php 
/*
* @ custom script to add watermark image on the product image that has -f in the product image name
*/
use Magento\Framework\App\Bootstrap;

require __DIR__ . '/../app/bootstrap.php';
 
$bootstrap = Bootstrap::create(BP, $_SERVER);
$objectManager = $bootstrap->getObjectManager();
 
$state = $objectManager->get('Magento\Framework\App\State');
$state->setAreaCode('frontend');
 
try
{   
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance(); 
    $categoryFactory = $objectManager->get('\Magento\Catalog\Model\CategoryFactory');
    $category = $categoryFactory->create()->load(4); //Parent category
    
    /*
    * @ $cateid array of category IDs
    */

    $cateid = $category->getAllChildren(true); // get all subcategory id

    $cateinstance = $objectManager->create('Magento\Catalog\Model\ResourceModel\Product\CollectionFactory');
    $allcategoryproduct = $cateinstance->create()->addAttributeToSelect('*')->addCategoriesFilter(['in' => $cateid]);

    $fileSystem = $objectManager->create('\Magento\Framework\Filesystem');
    $mediaPath = $fileSystem->getDirectoryRead(\Magento\Framework\App\Filesystem\DirectoryList::MEDIA)->getAbsolutePath();    

    $productimages = array();
    foreach ($allcategoryproduct as $products) {

        $product = $objectManager->create('Magento\Catalog\Model\Product')->load($products->getEntityId());

        $productimages = $product->getMediaGalleryImages();
        

        if(!empty($productimages)){             
            foreach($productimages as $productimage)
            {   
                $imgname = substr(strrchr(rtrim($productimage['file'], '/'), '/'), 1); // Get specific image name
                if(strpos($imgname, '-f') !== false){
                    $fullpath = $mediaPath.'catalog/product'.$productimage['file'];
                    if(file_exists($fullpath)){
                        watermark_image($fullpath, dirname(__FILE__)'/watermark-f.png', $fullpath);
                        echo $productimage['file']."\n";
                    }
                
                }
                
            }
        }
    }    
 
}
catch (\Exception $e)
{
    echo $e->getMessage();
    exit;
}

/*
* @ watermark_image function for merge watermark image to the product image
*/
function watermark_image($target, $wtrmrk_file, $newcopy) {
    $watermark = imagecreatefrompng($wtrmrk_file);
    imagealphablending($watermark, false);
    imagesavealpha($watermark, true);
    $img = imagecreatefromjpeg($target);
    $img_w = imagesx($img);
    $img_h = imagesy($img);
    $wtrmrk_w = imagesx($watermark);
    $wtrmrk_h = imagesy($watermark);
    
    imagecopy($img, $watermark, $img_w - $wtrmrk_w, $img_h - $wtrmrk_h, 0, 0, $wtrmrk_w, $wtrmrk_h);

    imagejpeg($img, $newcopy, 100);
    imagedestroy($img);
    imagedestroy($watermark);
}

?>

<?php

* @ custom script to add watermark image on the product image that has -f in the product image name

use Magento\Framework\App\Bootstrap;

require __DIR__ . '/../app/bootstrap.php';

$bootstrap = Bootstrap::create(BP, $_SERVER);

$objectManager = $bootstrap->getObjectManager();

$state = $objectManager->get('Magento\Framework\App\State');

$state->setAreaCode('frontend');

try

{

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();

$categoryFactory = $objectManager->get('\Magento\Catalog\Model\CategoryFactory');

$category = $categoryFactory->create()->load(4); //Parent category

* @ $cateid array of category IDs

$cateid = $category->getAllChildren(true); // get all subcategory id

$cateinstance = $objectManager->create('Magento\Catalog\Model\ResourceModel\Product\CollectionFactory');

$allcategoryproduct = $cateinstance->create()->addAttributeToSelect('*')->addCategoriesFilter(['in' => $cateid]);

$fileSystem = $objectManager->create('\Magento\Framework\Filesystem');

$mediaPath = $fileSystem->getDirectoryRead(\Magento\Framework\App\Filesystem\DirectoryList::MEDIA)->getAbsolutePath();

$productimages = array();

foreach ($allcategoryproduct as $products) {

$product = $objectManager->create('Magento\Catalog\Model\Product')->load($products->getEntityId());

$productimages = $product->getMediaGalleryImages();

if(!empty($productimages)){

foreach($productimages as $productimage)

{

$imgname = substr(strrchr(rtrim($productimage['file'], '/'), '/'), 1); // Get specific image name

if(strpos($imgname, '-f') !== false){

$fullpath = $mediaPath.'catalog/product'.$productimage['file'];

if(file_exists($fullpath)){

watermark_image($fullpath, dirname(__FILE__)'/watermark-f.png', $fullpath);

echo $productimage['file']."\n";

}

catch (\Exception $e)

{

echo $e->getMessage();

exit;

}

* @ watermark_image function for merge watermark image to the product image

function watermark_image($target, $wtrmrk_file, $newcopy) {

$watermark = imagecreatefrompng($wtrmrk_file);

imagealphablending($watermark, false);

imagesavealpha($watermark, true);

$img = imagecreatefromjpeg($target);

$img_w = imagesx($img);

$img_h = imagesy($img);

$wtrmrk_w = imagesx($watermark);

$wtrmrk_h = imagesy($watermark);

imagecopy($img, $watermark, $img_w - $wtrmrk_w, $img_h - $wtrmrk_h, 0, 0, $wtrmrk_w, $wtrmrk_h);

imagejpeg($img, $newcopy, 100);

imagedestroy($img);

imagedestroy($watermark);

}

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