thanks  but is there any way to echo the final src URL on the html instead of that one that starts with image_transcoder.php I don't need resizing, I just need the url of the original photo printed in the html. This will be very important for our image SEO.

If resizing isn't used then it will be direct URL to the image which never changes, also if you are talking about images in Froala editor then please take into account that Froala will be removed in UNA 13 and it's recommended to stop using it.