fix

chess_image_to_fen_tool.py

@@ -33,7 +33,7 @@ def chess_image_to_fen(image_path_in_base64:str, current_player: Literal["black"
     
     if not base64_image:
         raise ValueError("Failed to encode image to base64.")
-    base64_image_encoded =  f"data:image/jpeg;base64,{base64_image}"
+    base64_image_encoded =  f"data:image/png;base64,{base64_image}"
     url = CHESSVISION_TO_FEN_URL
     payload = {
         "board_orientation": "predict",