You need to upload two square PNG or JPG images that differ slightly from each other in several places (from 5 to 20). It is recommended PNG format and size 512x512. Differences should be noticeable, not overly small and yet compact. After loading the second picture, click the processing button.
Attention! After that, before clicking the publish button, check very carefully that the program correctly recognized all areas of difference and did not add unnecessary ones.