Support saving I;16L images

Author: radarhere

Tests/test_file_tiff.py

@@ -49,25 +49,10 @@ def test_sanity(self, tmp_path: Path) -> None:
  assert im.size == (128, 128)
  assert im.format == "TIFF"
 
- hopper("1").save(filename)
- with Image.open(filename):
- pass
-
- hopper("L").save(filename)
- with Image.open(filename):
- pass
-
- hopper("P").save(filename)
- with Image.open(filename):
- pass
-
- hopper("RGB").save(filename)
- with Image.open(filename):
- pass
-
- hopper("I").save(filename)
- with Image.open(filename):
- pass
+ for mode in ("1", "L", "P", "RGB", "I", "I;16", "I;16L"):
+ hopper(mode).save(filename)
+ with Image.open(filename):
+ pass
 
  @pytest.mark.skipif(is_pypy(), reason="Requires CPython")
  def test_unclosed_file(self) -> None:

src/PIL/TiffImagePlugin.py

@@ -1680,6 +1680,7 @@ def _setup(self) -> None:
  "PA": ("PA", II, 3, 1, (8, 8), 2),
  "I": ("I;32S", II, 1, 2, (32,), None),
  "I;16": ("I;16", II, 1, 1, (16,), None),
+ "I;16L": ("I;16L", II, 1, 1, (16,), None),
  "F": ("F;32F", II, 1, 3, (32,), None),
  "RGB": ("RGB", II, 2, 1, (8, 8, 8), None),
  "RGBX": ("RGBX", II, 2, 1, (8, 8, 8, 8), 0),
@@ -1963,7 +1964,7 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
  # we're storing image byte order. So, if the rawmode
  # contains I;16, we need to convert from native to image
  # byte order.
- if im.mode in ("I;16B", "I;16"):
+ if im.mode in ("I;16", "I;16B", "I;16L"):
  rawmode = "I;16N"
 
  # Pass tags as sorted list so that the tags are set in a fixed order.