feat: 同步报销流程与工作台改动

remove_bg.py

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+import sys
+from PIL import Image
+
+def remove_white_bg(input_path, output_path, threshold=235):
+    img = Image.open(input_path).convert("RGBA")
+    data = img.getdata()
+    new_data = []
+    
+    for item in data:
+        r, g, b, a = item
+        avg = (r + g + b) / 3.0
+        
+        # If it's very close to white, make it transparent
+        if avg > threshold and min(r,g,b) > threshold - 10:
+            # Feathering the alpha channel
+            # 255 = fully transparent
+            # threshold = fully opaque
+            factor = (avg - threshold) / (255 - threshold)
+            alpha = int(255 * (1 - factor))
+            
+            # Clamp alpha
+            alpha = max(0, min(255, alpha))
+            
+            # We keep the pixel white to avoid dark fringes, but lower its opacity
+            new_data.append((255, 255, 255, alpha))
+        else:
+            new_data.append(item)
+            
+    img.putdata(new_data)
+    
+    # Optional: crop the image to its bounding box
+    bbox = img.getbbox()
+    if bbox:
+        img = img.crop(bbox)
+        
+    img.save(output_path, "PNG")
+
+if __name__ == "__main__":
+    remove_white_bg(sys.argv[1], sys.argv[2])