Update README.md

README.md

@@ -8,4 +8,60 @@ image_processor = ModularPipeline.from_pretrained("YiYiXu/WanImageProcessor", tr
 image = image_processor(
     image="https://huggingface.co/datasets/YiYiXu/testing-images/resolve/main/wan_i2v_input.JPG",
     max_area=1280*704, output="processed_image")
+```
+
+
+this is the function
+
+```py
+# copied from https://github.com/Wan-Video/Wan2.2/blob/388807310646ed5f318a99f8e8d9ad28c5b65373/wan/utils/utils.py#L136
+def best_output_size(w, h, dw, dh, expected_area):
+    # float output size
+    ratio = w / h
+    ow = (expected_area * ratio)**0.5
+    oh = expected_area / ow
+
+    # process width first
+    ow1 = int(ow // dw * dw)
+    oh1 = int(expected_area / ow1 // dh * dh)
+    assert ow1 % dw == 0 and oh1 % dh == 0 and ow1 * oh1 <= expected_area
+    ratio1 = ow1 / oh1
+
+    # process height first
+    oh2 = int(oh // dh * dh)
+    ow2 = int(expected_area / oh2 // dw * dw)
+    assert oh2 % dh == 0 and ow2 % dw == 0 and ow2 * oh2 <= expected_area
+    ratio2 = ow2 / oh2
+
+    # compare ratios
+    if max(ratio / ratio1, ratio1 / ratio) < max(ratio / ratio2,
+                                                 ratio2 / ratio):
+        return ow1, oh1
+    else:
+        return ow2, oh2
+
+
+    
+    @property
+    def expected_configs(self):
+        return [
+            ConfigSpec(name="patch_size", default=(1, 2, 2)),
+            ConfigSpec(name="vae_stride", default=(4, 16, 16)),
+        ]
+    
+image = load_image(block_state.image).convert("RGB")
+max_area = 1280*704
+
+ih, iw = image.height, image.width
+dh, dw = pipe.transformer.config.patch_size[1] * pipe.vae_scale_factor_spatial, pipe.transformer.config.patch_size[2] * pipe.vae_scale_factor_spatial
+ow, oh = best_output_size(iw, ih, dw, dh, max_area)
+
+scale = max(ow / iw, oh / ih)
+resized_image = image.resize((round(iw * scale), round(ih * scale)), Image.LANCZOS)
+
+# center-crop
+x1 = (resized_image.width - ow) // 2
+y1 = (resized_image.height - oh) // 2
+image = resized_image.crop((x1, y1, x1 + ow, y1 + oh))
+
 ```