Region annotation is used for some images on Wikimedia Commons and a lot of Manga pages on the booru sites[1]. It's really, really good for translations. [1]:

Region annotation is used for some images on Wikimedia Commons and a lot of Manga pages on the booru sites[1]. It's really, really good for translations. [1]: https://danbooru.donmai.us/posts/6510411?q=arknights https://danbooru.donmai.us/posts/6510411?q=arknights