chore: import upstream snapshot with attribution

invokeai/app/services/external_generation/image_utils.py

@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+import base64
+import io
+
+from PIL import Image
+from PIL.Image import Image as PILImageType
+
+
+def encode_image_base64(image: PILImageType, format: str = "PNG") -> str:
+    buffer = io.BytesIO()
+    image.save(buffer, format=format)
+    return base64.b64encode(buffer.getvalue()).decode("ascii")
+
+
+def decode_image_base64(encoded: str) -> PILImageType:
+    data = base64.b64decode(encoded)
+    image = Image.open(io.BytesIO(data))
+    return image.convert("RGB")