title: Opening Tif file with PIL "PIL.UnidentifiedImageError: cannot identify image file"
body: <p>I've a huge TIF file of shape (39906, 30365, 4). I want to use it on PyQt5, however when I use PIL to open the image it gives the error &quot;PIL.UnidentifiedImageError: cannot identify image file&quot;.
  I've searched and it seems that PIL can open TIF/TIFF files, but it has to be 8bit and my image is 8bit.</p>
  <p>What could I do fix it? Is the file to large to be open by PIL? Is there another option to open a huge TIF to be used with PyQt5?</p>
  <p>It's not necessary to open the whole image. Actually, if I could open a 25% scaled version of the original would be better.</p>
  <p>Pillow version = 7.2.0</p>