ENH: Allow kwargs in generic save method

nibabel/loadsave.py

@@ -78,7 +78,7 @@ def guessed_image_type(filename):
     raise ImageFileError(f'Cannot work out file type of "{filename}"')
 
 
-def save(img, filename):
+def save(img, filename, **kwargs):
     """ Save an image to file adapting format to `filename`
 
     Parameters
@@ -96,7 +96,7 @@ def save(img, filename):
 
     # Save the type as expected
     try:
-        img.to_filename(filename)
+        img.to_filename(filename, **kwargs)
     except ImageFileError:
         pass
     else:
@@ -144,7 +144,7 @@ def save(img, filename):
     # Here, we either have a klass or a converted image.
     if converted is None:
         converted = klass.from_image(img)
-    converted.to_filename(filename)
+    converted.to_filename(filename, **kwargs)
 
 
 @deprecate_with_version('read_img_data deprecated. '