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Magento 2 Get specific attribute (manufacturer) collection in phtml file with images using object manager

Magento 2 Get specific attribute (manufacturer) with images using object manager

 <?php  
 $om = \Magento\Framework\App\ObjectManager::getInstance();  
 $categoryFactory = $om->get('\Magento\Catalog\Model\CategoryFactory');  
 $categoryHelper = $om->get('\Magento\Catalog\Helper\Category');  
 $categoryRepository = $om->get('\Magento\Catalog\Model\CategoryRepository');  
 $category = $categoryFactory->create()->load($catId);  
 $categoryProducts = $category->getProductCollection()  
                ->addAttributeToSelect('*');  
 foreach ($categoryProducts as $_product) {  
   if($_product->getManufacturer()){  
  $brand_value = $_product->getResource()->getAttribute('manufacturer')->getFrontend()->getValue($_product);  
  $brand_id = $_product->getManufacturer();  
  $curnt_cat_url = $category->getUrl();  
  $brandId = '?manufacturer='.$brand_id;  
  $om = \Magento\Framework\App\ObjectManager::getInstance();  
  $swatchHelper=$om->get("Magento\Swatches\Helper\Media");  
  $swatchCollection = $om->create('Magento\Swatches\Model\ResourceModel\Swatch\Collection');  
  $swatchCollection->addFieldtoFilter('option_id',$brand_id);  
  $item=$swatchCollection->getFirstItem();  
  $ThumbImage = $swatchHelper->getSwatchAttributeImage('swatch_thumb', $item->getValue());  
  $SwatchImage = $swatchHelper->getSwatchAttributeImage('swatch_image', $item->getValue());  
  ?>  
  <div class="brand_bg">  
   <a href="<?php echo $curnt_cat_url.$brandId; ?>" title="<?php echo $brand_value; ?>" ><img src="<?php echo $ThumbImage; ?>"></a>  
  </div>  
  <?php } ?>  
 <?php } ?>

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