change image format to png

app.py

@@ -305,8 +305,8 @@ def __generateImage(prompt: str):
             "megapixels": "1",
             "num_outputs": 1,
             "aspect_ratio": "4:3",
-            "output_format": "webp",
-            "output_quality": 80,
+            "output_format": "png",
+            # "output_quality": 80,
             "num_inference_steps": 4
         }
     )