link to references

Change-Id: I49b9ab206ade37a8a5535b21fa7fdf62a0c569d2

Author: MarkDaoust

google/generativeai/types/content_types.py

@@ -73,6 +73,10 @@
 
 
 def pil_to_blob(img):
+    # References:
+    #   - file formats: https://pillow.readthedocs.io/en/stable/handbook/image-file-formats.html
+    #   - image modes: https://pillow.readthedocs.io/en/stable/handbook/concepts.html#modes
+
     bytesio = io.BytesIO()
 
     get_mime = getattr(img, "get_format_mimetype", None)