Update utils.py

utils.py

@@ -32,10 +32,11 @@ def read_image_file(file) -> Image.Image:
 
 def pil_to_base64(img, format="jpeg", encode=False):
     if encode:
-        buffer = BytesIO()
-        img.save(buffer, format)
-        buffer.seek(0)
-        return buffer
+        bytes_object = BytesIO()
+        img.save(bytes_object, format)
+        bytes_object.seek(0)
+        b64 = base64.b64encode(bytes_object.getvalue()).decode("ascii")
+        return b64
     else:
         temp_path = f"temp.{format}"
         img.save(temp_path)