Since a YouTube video's thumbnail could convince or deter viewers from hitting play, we're sure a lot of creators would love the website's new and improved automatic thumbnailer. According to the Google Research Blog's announcement post, the website analyzes videos you upload at one frame per second and scores each frame based on their quality. The generator will then display images that scored high enough during analysis. But, how exactly does YouTube's algorithm know how to score images? Apparently, by training it to recognize between good and bad photos.