When you encounter the text in your web browser, you are looking at a directory listing (also known as a folder index). Instead of displaying a formatted webpage (like a gallery or homepage), the web server is showing you a raw list of every file and subfolder stored inside the /photo/full directory.
If you are trying to organize a large library of photos to make them searchable by the text contained them (like signs or documents): OCR (Optical Character Recognition) : Tools like Adobe Acrobat UltraFinder can scan images to create a searchable text index. : Modern software like Excire Photo index of photo full