Pillow rotate not quite right

Question

It is hard to explain so please look at the image. It appears to rotate the data within the image but not the image itself.

original:

Rotated -90:

    block = scene.read_block()
    image = PILImage.fromarray(block)
    image_rotate = image.rotate(-90)
    buf = BytesIO()
    image_rotate.save(buf, "JPEG", quality=90)        
    return buf.getvalue()  

The viewport didn't rotate only the image inside.

Thanks

Answer 1

you need to use expand=True to change the size

image.rotate(-90, expand=True)

it is in the documentation