how can you prove that you have photographic memory?
It will be very obvious if you have photographic memory. However, to be a hundred percent sure, you can either check with a doctor or use online resources. Many collages have made Photographic Tests, where it usually contains a picture for you to memorize. It will then ask you questions such as how many houses there were, the colour of their roofs, and if the lights in the houses were on or off.
Below is a screenshot:
Below is a screenshot:
Testing yourself
You can also test yourself to see if you have photographic memory. For example, the picture above, "Big Ben" was made by an artist called Stephen Wiltshire, who didn't use any other material but his brain. This picture refers to the rainy evening of London.