Hello there, my first post here so hopefully something useful. 
I am currently working with TIFF images and so far found the rasterio 30 library the best option in terms of installation ease, functionalities, speed, and so on.
Here is a short code snippet to expand on what @jytug has already answered:
from torchvision.transforms import ToTensor
import rasterio
image = rasterio.open(f"path/to/image.tiff")
image = ToTensor()(image)

The only problem I had with PIL is that you need to change the max size otherwise it errors (preventing DOS bomb attack apparently).
Finally, notice that you need some amount of RAM if the image is big of course.