Basics

https://qiita.com/phyblas/items/471952d609e31d116bf7

https://docs.opencv.org/4.x/d4/da8/group__imgcodecs.html#gacbaa02cffc4ec2422dfa2e24412a99e2

• If EXIF information is embedded in the image file, the EXIF orientation will be taken into account, and thus the image will be rotated accordingly unless the flags IMREAD_IGNORE_ORIENTATION or IMREAD_UNCHANGED are passed.

https://pillow.readthedocs.io/en/stable/reference/ImageOps.html#PIL.ImageOps.exif_transpose