diff --git a/replicate_predictor.py b/replicate_predictor.py
index 66e7d2f..e46be99 100644
--- a/replicate_predictor.py
+++ b/replicate_predictor.py
@@ -18,10 +18,11 @@ class ReplicatePredictor(BasePredictor):
     def predict(
         self,
         text: str = Input(default='Dali painting of WALL·E'),
+        output_png: bool = Input(default=False),
         intermediate_outputs: bool = Input(default=True),
         grid_size: int = Input(ge=1, le=9, default=5),
-        log2_temperature: float = Input(ge=-3, le=3, default=0.0),
-        log2_top_k: int = Input(ge=0, le=14, default=7),
+        log2_temperature: float = Input(ge=-3, le=3, default=2),
+        log2_top_k: int = Input(ge=0, le=14, default=4),
         log2_supercondition_factor: float = Input(ge=2, le=6, default=4)
     ) -> Iterator[Path]:
         log2_mid_count = 3 if intermediate_outputs else 0
@@ -40,7 +41,7 @@ class ReplicatePredictor(BasePredictor):
         path = Path(tempfile.mkdtemp())
         for image in image_stream:
             i += 1
-            ext = 'png' if i == 2 ** log2_mid_count else 'jpg'
+            ext = 'png' if i == 2 ** log2_mid_count and output_png else 'jpg'
             image_path = path / 'min-dalle-iter-{}.{}'.format(i, ext)
             image.save(str(image_path))
             yield image_path
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