diff --git a/api/onnx_web/chain/highres.py b/api/onnx_web/chain/highres.py
index 523b9a3a..2a43e051 100644
--- a/api/onnx_web/chain/highres.py
+++ b/api/onnx_web/chain/highres.py
@@ -57,7 +57,7 @@ def stage_highres(
 
         chain.stage(
             BlendImg2ImgStage(),
-            stage,
+            stage.with_args(outscale=1),
             overlap=params.vae_overlap,
             prompt_index=prompt_index + i,
             strength=highres.strength,
diff --git a/api/onnx_web/chain/tile.py b/api/onnx_web/chain/tile.py
index f600d06b..b88d9628 100644
--- a/api/onnx_web/chain/tile.py
+++ b/api/onnx_web/chain/tile.py
@@ -156,7 +156,6 @@ def blend_tiles(
     value = np.zeros(scaled_size)
 
     for left, top, tile_image in tiles:
-        # TODO: histogram equalization
         equalized = np.array(tile_image).astype(np.float32)
         mask = np.ones_like(equalized[:, :, 0])
 
diff --git a/api/onnx_web/diffusers/run.py b/api/onnx_web/diffusers/run.py
index 5991c57a..f5bd3a06 100644
--- a/api/onnx_web/diffusers/run.py
+++ b/api/onnx_web/diffusers/run.py
@@ -64,21 +64,20 @@ def run_txt2img_pipeline(
 
     # apply upscaling and correction, before highres
     highres_size = params.unet_tile
-    stage = StageParams(tile_size=highres_size)
-
     if params.is_panorama():
+        if server.has_feature("panorama-highres"):
+            # run the whole highres pass with one panorama call
+            highres_size = tile_size * highres.scale
+
         chain.stage(
             BlendDenoiseStage(),
-            stage,
+            StageParams(tile_size=highres_size),
         )
 
-        if server.has_feature("panorama-highres"):
-            highres_size = tile_size * highres.scale
-
     first_upscale, after_upscale = split_upscale(upscale)
     if first_upscale:
         stage_upscale_correction(
-            stage,
+            StageParams(outscale=first_upscale.outscale, tile_size=highres_size),
             params,
             chain=chain,
             upscale=first_upscale,
@@ -86,7 +85,7 @@ def run_txt2img_pipeline(
 
     # apply highres
     stage_highres(
-        stage,
+        StageParams(outscale=highres.scale, tile_size=highres_size),
         params,
         highres,
         upscale,
@@ -96,7 +95,7 @@ def run_txt2img_pipeline(
 
     # apply upscaling and correction, after highres
     stage_upscale_correction(
-        stage,
+        StageParams(outscale=after_upscale.outscale, tile_size=highres_size),
         params,
         chain=chain,
         upscale=after_upscale,
diff --git a/api/onnx_web/params.py b/api/onnx_web/params.py
index efac3742..7d0ad48c 100644
--- a/api/onnx_web/params.py
+++ b/api/onnx_web/params.py
@@ -369,6 +369,17 @@ class StageParams:
         self.tile_order = tile_order
         self.tile_size = tile_size
 
+    def with_args(
+        self,
+        **kwargs,
+    ):
+        return StageParams(
+            name=kwargs.get("name", self.name),
+            outscale=kwargs.get("outscale", self.outscale),
+            tile_order=kwargs.get("tile_order", self.tile_order),
+            tile_size=kwargs.get("tile_size", self.tile_size),
+        )
+
 
 class UpscaleParams:
     def __init__(
diff --git a/api/tests/test_diffusers/test_run.py b/api/tests/test_diffusers/test_run.py
index e9988116..e4004e15 100644
--- a/api/tests/test_diffusers/test_run.py
+++ b/api/tests/test_diffusers/test_run.py
@@ -149,10 +149,11 @@ class TestTxt2ImgPipeline(unittest.TestCase):
                 3.0,
                 1,
                 1,
+                unet_tile=256,
             ),
             Size(256, 256),
             ["test-txt2img-highres.png"],
-            UpscaleParams("test"),
+            UpscaleParams("test", scale=2, outscale=2),
             HighresParams(True, 2, 0, 0),
         )