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app.py

@@ -373,9 +373,8 @@ def preprocess_image(input: Image.Image) -> Image.Image:
     output_np = np.array(output).astype(np.float32)
     rgb = output_np[:, :, :3]
     alpha = output_np[:, :, 3:4] / 255.0
-    # Use threshold to avoid darkening foreground pixels with slightly transparent alpha
-    # Pixels with alpha > 0.5 keep their full RGB, pixels below are blacked out
-    mask = (alpha > 0.5).astype(np.float32)
+    # Keep full RGB for visible pixels, zero out transparent background
+    mask = (alpha > 0.05).astype(np.float32)
     rgb = rgb * mask
     output = Image.fromarray(rgb.astype(np.uint8))
     return output