The below code will render the image in the product description attribute.
$productDescription = $this->helper('Magento\Catalog\Helper\Output')->productAttribute($_product, $_product->getDescription(), 'description');
echo $productDescription;
This code can be used for any Text Area or Text Editor (WYSIWYG) attribute.
Please replace the $_product->getDescription() and 'description' with the appropriate attribute code.
Using the above code you can render the image from Text Area / WYSIWYG product attribute.
Thank You
Mohana Krishnan