I am wondering when creating a new document in Photoshop about the color mode options. If you choose
RGB Color there's another option via a drop-down which you can chose 16bit.
When I create a 1300px × 5000px 16bit document and save, the file size is already 32mb compared to 371kb with an 8bit document.
Why is there such a difference in file size and what is the use of 16bit vs 8bit?