como puedo buscar una imagen sin que sea exacta la coincidencia para poder encontrar imagenes cuando cambia un poco su color o resolucion

Hello, good afternoon, can someone help me with a small code that takes a screenshot and saves the image in a certain folder with the name "captura.png" if there is an image with the same name that replaces it, please help favor [Mod edit: Changed subject from "trouble" to something descriptive of t...