KeyError when setting PNG artwork of mode LA

[hammady]

With Pillow installed, I'm trying to set an artwork with this PNG image: https://1drv.ms/i/s!Aq1PMiDnHe9tk6FFfAZPq36aBZwRIQ?e=ayRcrb

Here is my code:

import music_tag

media_path = "/path/to/media"
image_path = "/path/to/image"
tags = music_tag.load_file(media_path)
with open(image_path, 'rb') as img:
    tags["artwork"] = img.read()

I'm getting this error:

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
Cell In[9], line 2
      1 with open(f'data/artists/media/{artist_id}/artwork.png', 'rb') as img:
----> 2     tags["artwork"] = img.read()

File ~/Workspace/media-downloader/.venv/lib/python3.11/site-packages/music_tag/file.py:603, in AudioFile.__setitem__(self, norm_key, val)
    602 def __setitem__(self, norm_key, val):
--> 603     self.set(norm_key, val)

File ~/Workspace/media-downloader/.venv/lib/python3.11/site-packages/music_tag/file.py:500, in AudioFile.set(self, norm_key, val, typeless)
    497 md_sanitizer = None if typeless else tmap.sanitizer
    499 if not isinstance(val, MetadataItem):
--> 500     val = MetadataItem(md_type, md_sanitizer, val)
    502 if hasattr(tmap.setter, '__call__'):
    503     tmap.setter(self, norm_key, val)

File ~/Workspace/media-downloader/.venv/lib/python3.11/site-packages/music_tag/file.py:67, in MetadataItem.__init__(self, typ, sanitizer, val)
     65 self.type = typ
     66 self.sanitizer = sanitizer
---> 67 self.values = val

File ~/Workspace/media-downloader/.venv/lib/python3.11/site-packages/music_tag/file.py:92, in MetadataItem.values(self, val)
     90     v = self.sanitizer(v)
     91 if not (self.type is None or v is None or isinstance(v, self.type)):
---> 92     v = self.type(v)
     93 self._values[i] = v

File ~/Workspace/media-downloader/.venv/lib/python3.11/site-packages/music_tag/file.py:187, in Artwork.__init__(self, raw, width, height, fmt, depth, pic_type)
    184     fmt = img.format.lower()
    185     mode2depth = {'1': 1, 'L': 8, 'P': 8, 'RGB': 24, 'RGBA': 32,
    186                   'CMYK': 32, 'YCbCr': 24, 'I': 32, 'F': 32}
--> 187     depth = mode2depth[img.mode]
    188 except ImportError:
    189     width = None

KeyError: 'LA'

Looks like some PNG modes are unsupported.