Comment by mattstir

> or on the fly using stable diffusion

Steganography fundamentally requires you to be able to know where the data is, which requires you to have the original image to compare against. The only other strategy I'm aware of is setting known pixel positions to exact data, which is very easy for basic tools to spot and decode. Or to add the data to non-visual data blocks if the image format supports those, which is also quite easy to spot.