Renamed argument to big_tiff

Tests/test_file_tiff.py

@@ -117,7 +117,7 @@ class TestFileTiff:
 
     def test_bigtiff_save(self, tmp_path: Path) -> None:
         outfile = str(tmp_path / "temp.tif")
-        hopper().save(outfile, bigtiff=True)
+        hopper().save(outfile, big_tiff=True)
 
         with Image.open(outfile) as im:
             assert im.tag_v2._bigtiff is True

docs/handbook/image-file-formats.rst

@@ -1208,7 +1208,7 @@ The :py:meth:`~PIL.Image.Image.save` method can take the following keyword argum
 
     .. versionadded:: 8.4.0
 
-**bigtiff**
+**big_tiff**
     If true, the image will be saved as a BigTIFF.
 
 **compression**

src/PIL/TiffImagePlugin.py

@@ -1691,7 +1691,7 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
     encoderconfig = im.encoderconfig
 
     ifd = ImageFileDirectory_v2(prefix=prefix)
-    if encoderinfo.get("bigtiff"):
+    if encoderinfo.get("big_tiff"):
         ifd._bigtiff = True
 
     try: